The gross total amount that has to be paid by Isabella’s
mom is equal to the summation of the amount paid for the games, pizza, and
tokens. If we let x be this total, the equation becomes,
x = ($7) +
6($3.5) + ($17.25) + 10($4)
x
= $85.25
Because she has a coupon for 1/10 of the total bill, the
amount that she is to pay is only 9/10 of the total amount.
x
= ($85.25)(9/10)
x
= $76.725
Hence, the total amount that has to be paid by Isabella’s
mom is $76.725.
