Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Rocco stores his coins in piles of 10 coins each. He has 4 piles of quarters, 6 piles of dimes, 9 piles of nickels, and 5 piles of pennies. How much money does Rocco have?


### Response:
 Chaque pile contient 10 pièces, donc il a :
10 * 4 * 0,25 $ = 10 en quartiers,
10 * 6 * 0,10 $ = 6 en dimes,
10 * 9 * 0,05 $ = 4,50 en nickels, et
10 * 5 * 0,01 $ = 0,50 en pennies.
Au total, il a 10 + 6 + 4,50 + 0,50 = 21