Workshop/Cash Bonus
From The Tower - Idle Tower Defense Wiki and Guides
Cash earned from all sources multiplier (includes wave bonus).
Unlocked in 
Workshop for 40 coins with Cash/Wave. There are 149 levels with a base of x1.00 that increases by 0.01 each level for a total of x2.49. Cash bonus does not increase interest nor will it increase max interest.
| Level | Value | Cost | Total Cost |
|---|---|---|---|
| 1 | 1.01x | 30.00 | 30.00 |
| 10 | 1.10x | 674.00 | 2.76K |
| 20 | 1.20x | 2.88K | 20.16K |
| 30 | 1.30x | 7.06K | 70.23K |
| 40 | 1.40x | 13.47K | 174.15K |
| 50 | 1.50x | 22.31K | 355.40K |
| 60 | 1.60x | 34.77K | 647.75K |
| 70 | 1.70x | 49.38K | 1.07M |
| 80 | 1.80x | 70.30K | 1.68M |
| 90 | 1.90x | 91.98K | 2.50M |
| 100 | 2.00x | 117.01K | 3.55M |
| 110 | 2.10x | 157.13K | 4.98M |
| 120 | 2.20x | 191.73K | 6.74M |
| 130 | 2.30x | 257.88K | 9.00M |
| 140 | 2.40x | 305.53K | 11.84M |
| 149 | 2.49x | 352.36K | 14.82M |