###Human: 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?, ### Assistant: His income tax is 10% of 500 which is 500*10% = $50.
His tithe costs 10% of $500 which is 500*10% = $50.
The total expenses are 50 + 55 + 50 = $155
He is then left with $500 - $ 155= $345. 
 So the answer is :  345