The balance on Amanda's credit card is $4000. It has an interest rate of 16.5%. She wants to compare the difference between paying $75 and $100 of the monthly balance. How much does she save interest and fees if she pays $100 instead of $75? Round to the nearest dollar. Enter your answer as a total in, such as $125.​

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?