Question

Write an expression for the amount of change you will get when you pay for a purchase p with a $20 bill. Make a table for the amount of change you will get for purchases of $11.59, $17.50, $19.00 and $20

Answer 1

Change received = $20 - p ⇒ this is the expression

The table:

Purchase Paid Change

$11.59 $20 $20 - $11.59 = $8.41
$17.50 $20 $20 - $17.50 = $2.50
$19.00 $20 $20 - $19.00 = $1.00
$20.00 $20 $20 - $20 = $0