Here is the solution on how much the total amount that Lisa paid:
The total amount for all the items is $53: $10 + $20 + $23 = $53
Now, 7.2% = 0.072
Compute for the sales tax of each item:
$10 x 0.072 = .72
$20 x 0.072 = 1.44
$23 x 0.072 = 1.66
The total sales tax would be: .72 + 1.44 + 1.66 = $3.82
Now add the Sales tax to the total price of the items. $53 + 3.82 = $56.82
Therefore, Lisa paid $56.82.
