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

### Instruction:
 Jackson and Brandon both invest $500 in the stock market. Jackson's investment quadruples in value, while Brandon's is reduced to 20% of the initial value. How much more money does Jackson have than Brandon now?


### Response:
 L'investissement de Jackson a quadruplé, il devient donc 500 x 4 = 2000 $.
Celui de Brandon est réduit à 20%, il devient donc 500 x 20% = 100 $.
Ainsi, Jackson a 2000 $ - 100 $ = 1900 $ de plus que Brandon.