On average you would make $59.75 more each week at your new job.
In order to find this, we look at the total amount you make an hour at the new job. Although it only pays $7.15, you have to add an additional $3 each hour for tips. This makes the net amount you make each hour $10.15. We then multiply that amount by the amount of hours to get your weekly pay.
$10.15 * 15 = $152.25
For the first job, we don't have to do any addition. We can simply multiply the rate by the hours.
$9.25 * 10 = $92.50
Now we subtract the new amount by the old amount.
$152.25 - $92.50 = $59.75
