[ZeonOne]

This has been posted awhile back By Random Jacker and Torch.

Here is the formula.

On every recursion, you add (10k+ the previous upgrade cost) to the final cost of the previous slot.

For example to calculate the cost for the fifth slot.
(10k + 20k) + 20k = 50k

6th slot would be
(10k + 30k) + 50k = 90k

7th Slot would be
(10k + 40k) + 90k = 140k

Use that formula to calcuate slot cost for future use.


4 $20,000,
5 $50,000,
6 $90,000,
7 $140,000,
8 $200,000,
9 $270,000,
10 $350,000,
11 $440,000,
12 $540,000,
13 $650,000,
14 $770,000,
15 $900,000,
16 $1,040,000,
17 $1,190,000,
18 $1,350,000,
19 $1,520,000,
20 $1,700,000,
21 $1,890,000,
22 $2,090,000,
23 $2,300,000,