If a question says an item is marked down by 20%
a) what percentage would you actually be paying of the original price
b) how would you write that as a decimal
**Both answer will be written as part of the answer part A/part B**

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?