**URGENT PLEASE HELP**
In 2015, a person working in the United States paid 10% income tax for income up to $9225. Income between $9226 and $37,450 was taxed at 15%.
Suppose John earns $9225, How much of his earnings does John take home after taxes?
Answer: $8302.5

I need help on this second part of that question:
If he were to get a raise, and John's entire check was taxed at 15% how much more would he need to earn to take home more than his current take-home pay?