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

### Instruction:
 Alex gets paid $500 a week and 10% of his weekly income is deducted as tax. He also pays his weekly water bill for $55 and gives away another 10% of his weekly income as a tithe. How much money does Alex have left?


### Response:
 Son impôt sur le revenu est de 10% de 500, soit 10/100*500 = 50 $.
Sa dîme coûte 10/100*500 = 50 $.
Les dépenses totales sont de 50 + 55 + 50 = 155 $.
Son revenu total est de 500 - 155 = 345 $.