Answer:
$49.01
Explanation:
Lisa buys a shirt which is $30.98 dollars and a hat for $20.01 dollars. Let's start with adding those two together.
$30.98 + $20.01 = $50.99
If her shirt and hat costs $50.99 and she gives the cashier $100.00 you would subtract her total from what she gave her.
$100.00 - $50.99 = $49.01 dollars
Lisa would receive $49.01 dollars back.