Creatively image a question and justification for this answer: 345

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The question is: 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?
Step-by-step reasoning process: 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.
