How get the cost price?

I have the following spreadsheet:

For column B, the formula is simple: B1 + (B1 * A2)

The question is: how to get the numbers in column C?

I manually typed all values on column C but the idea is if I type 24200 on C1, it calculates all the other values.

24200 - 10% = 21780

21780 is 220 less than the initial price of 22000.

Thank you.