Answer:
$13.50
Explanation:
10% of 75 is 7.50 so now we're at 67.5. 2 tubs of popcorn at 6.75 each is equal to 13.5. 67.5 - 13.5 is 54. The rest of the money was spent on tickets. Because it is a family of four we need 4 tickets so divide 54 by 4 which gives you 13.50.