First, we must figure out how much money seven $20 bills are worth. We can multiply 20 by 7 and we will get a product of 140.
If Dan's mom gives the cashier $140, Dan's mom will receive change. We can find out how much change she is getting by subtracting 126.62 from 140.
$140 - $126.62 = $13.38
Therefore, Dan's mom will get $13.38 in change.
