I do not understand how the recent average idol earnings are considered. Or why is the recent average earnings equal to all-time earnings divided by 4?
Example: I have an advertising contract for 56 k per week, then the average and all-time earnings will change as in the table below
| Weeks | Recent average earnings | Total earning |
| 1 week | 14 k | 56 k |
| 2 week | 28 k | 112 k |
| 3 week | 42 k | 168 k |
| 4 week | 56 k | 224 k |
| 5 week | 70 k | 280 k |
