Do you see information given about the angle theta, zero greater than equal to feet is greater than or equal to two pi, to find the exact value of Cos theta over two

Agroup of five people go out to eat and buy appetizers and main dishes they decide to split the bill so each person pays 20% of the total cost appetizers are $5 and main dishes are $10 write an expression to show how much each person pays explain it with how to solve the problem