Little known fun fact is that when he's not playing soccer, Lionel Messi works part-time as an iPhone salesperson at an Apple Genius Bar. He earns $7.50 per hour plus a percent commission on all of his sales of iPhones. Last week Lionel worked 15 hours and his paycheck ended up being $316.50. If his total sales for the week were $3,750, what percent commission does Lionel earn? If necessary, round your answer to the nearest hundredth of a percent.

Messi earns % commission.