His income tax is 10% of 500 which is 500*10% = $<<500*10*.01=50>>50.
His tithe costs 10% of $500 which is 500*10% = $<<500*10*.01=50>>50.
The total expenses are 50 + 55 + 50 = $155
He is then left with $500 - $ 155= $<<500-155=345>>345.
#### 345