The Houston Chronicle reported on the profits of Oshman's Sporting Goods. For the fourth quarter, Oshman's reported net income of $7.3 million. That compares with a net income of $1.5 million the same quarter a year earlier. Net sales for the quarter increased 12.5% to $105.4 million.

1. What was Oshman's profit margin on net sales this quarter?
2. What was the percent increase in net income?
3. What were last year's net sales?
4. What was last year's profit margin on net sales?