Randall is saving money to buy a bicycle. he has $37.80 in his savings account and saves 20% of his paper route earnings each week. after 10 weeks, he has $87.80 in his savings account. how much does randall earn each week from his paper route?
$25.00
$17.56
$7.56
$5.00

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?