Rupie Mine

Rupie Mine

Description

A facility for mining rupies from the earth. Shipments arrive in regular intervals, providing a great source of easy income!

Facility Type

Production

Size

3x3

Available

4

Obtained From

Story

Release Date

September 27, 2018

Short Summary

The Rupie Mine collects Rupies at set intervals and stores them up to a limit.
Note: Items can still be collected at the current level while the facility is under construction.
Two Rupie Mine are immediately available, and a 3rd and 4th mine can be built at Player Lv. 22 and 34, respectively.

Upgrade Table

Level	Prod. Time	Limit	Cost	Materials Required	Build Time	Payback PeriodSee "Payback Period" section for explanation
1	8 hr	2,640	50	—	3 sec	0.0063 days
2	8 hr	2,810	100	—	30 sec	0.1961 days
3	8 hr	2,970	150	—	1 min	0.3125 days
4	8 hr	3,140	200	—	3 min	0.3922 days
5	8 hr	3,300	250	—	5 min	0.5208 days
6	8 hr	3,470	300	x1	10 min	0.5882 days
7	8 hr	3,630	350	x1	20 min	0.7292 days
8	8 hr	3,800	400	x1	40 min	0.7843 days
9	8 hr	3,960	500	x2	1 hr	1.0417 days
10	8 hr	4,130	600	x2	2 hr	1.1765 days
11	8 hr	4,290	700	x3	3 hr	1.4583 days
12	8 hr	4,460	800	x3	4 hr	1.5686 days
13	8 hr	4,620	900	x3	5 hr	1.8750 days
14	8 hr	4,790	1,000	x5	6 hr	1.9608 days
15	8 hr	4,950	1,100	x5	7 hr	2.2917 days
16	8 hr	5,120	1,200	x8, x1	8 hr	2.3529 days
17	8 hr	5,280	1,400	x8, x1	10 hr	5.6666 days
18	8 hr	5,450	1,600	x8, x1	12 hr	8.4804 days
19	8 hr	5,610	1,800	x10, x1	14 hr	12.5156 days
20	8 hr	5,780	2,000	x10, x1	16 hr	15.2549 days
21	8 hr	5,940	2,200	x15, x2	18 hr	20.0521 days
22	8 hr	6,110	2,400	x15, x2	20 hr	22.6765 days
23	8 hr	6,270	2,600	x15, x2	22 hr	28.2560 days
24	8 hr	6,440	2,800	x20, x2	24 hr	30.7451 days
25	8 hr	6,600	3,000	x20, x2	28 hr	34.3750 days
26	8 hr	6,770	3,200	x30, x3, x1	32 hr	46.0980 days
27	8 hr	6,930	3,400	x30, x3, x1	36 hr	57.6146 days
28	8 hr	7,100	3,600	x30, x3, x1	40 hr	62.7451 days
29	8 hr	7,260	3,800	x40, x3, x1	44 hr	75.9792 days
30	8 hr	7,430	4,000	x40, x3, x1	48 hr	80.6863 days
Total			46,400	x325, x30, x5	16.7 days	—

Payback Period

The time it takes for each level of the Rupie Mine to pay itself off based on its improved earnings can be calculated with the following formula.

PaybackPeriod[hr] = BreakEvenTime[hr] + max(BuildTime[hr]-8[hr],0)

where

BreakEvenTime[hr] = (UpgradeCost[rup]+LostIncome[rup]) / (IncreasedIncomeDifference[rup]/8[hr])

with Lost Income defined as

LostIncome[rup] = (PrevProductionLimit[rup]/8[hr]) * max(BuildTime[hr]-8[hr],0)

The Break Even Time formula calculates the time it takes to recover the cost of the upgrade AND the lost income during construction at that level's increased income rate. The max() function rejects negative numbers, representing the fact that rupies are only lost when the build time exceeds 6 hours. The Build Time is added in the Payback Period formula to account for the period of time where the Rupie Mine does not produce any rupies after hitting its limit during construction. These all assume that you are NOT using / to speed up upgrades.

The payback period of one level has no effect on the payback period of another level. They are all independent, and some can occur simultaneously. As a consequence of this, when the payback period for Level 30 has passed, then ALL OTHER PAYBACK PERIODS will have completed BEFORE then and therefore that mine is no longer paying off the costs of ANY upgrades. Thus the fastest PaybackPeriod would be 95.3863 days (PaybackPeriod of Level 30 + Build Time of Level 1-29) assuming you did not speed up any upgrades and you immediately started the next upgrade as soon as the current one finished.

Variable	Description
PaybackPeriod	The time it takes to break even, and begin making profit from upgrading. This point is when the previous level mine and the current level mine would have made the same amount of money starting from when the upgrade button is pressed. This factors in the costs of the upgrade AND the rupies lost due to build time, as well as the amount of time it takes for the upgrade to finish.
BreakEvenTime	The amount of time it takes for the new level's increased income to generate enough profit to cover the losses from upgrading. This does NOT factor in build time, but it DOES factor in rupies lost due to build time.
max(BuildTime[hr]-8[hr],0)	Accounts for the period of time where your mine would be generating no rupies if the upgrade time exceeds the production time.
Upgrade Cost	The price (in rupies) of the level being upgraded to (The level the mine will be at after the upgrade finishes) For example, the upgrade cost of upgrading to Level 17 is 1400[rup].
LostIncome	The amount of rupies the mine would have generated if it hadnt been upgraded, thus effectively serving as a "bonus" Upgrade Cost. For example, the LostIncome of upgrading to Level 17 is: ((Level 16's Production Limit=5120[rup]) / 8[hr]) * (10[hr]-8[hr]) = 1280[rup].
IncreasedIncomeDifference	The difference between the next upgrade level's production limit and the current upgrade level's production limit. This will be 170[rup] when upgrading to an even level (such as Level 2) or 160[rup] when upgrading to an odd level (such as Level 3). The exception is Level 1 as there is no previous production value, and therefore the IncreasedIncomeDifference for Level 1 is its production limit of 2640[rup].
PrevProductionLimit	The total production limit of the level you are upgrading from. For example, when upgrading to Level 17 you would use the production limit of level 16 which is 5120[rup]