This year, the class plans to collect only one material and use the money earned to pay the total cost for the field trip for the 30 students. The amount of money earned from recycling this year is different from last year. • Cost per 1 pound of aluminum has decreased by 2 cents

•Cost per 1 pound of glass has increased by 3 cents.

Select either aluminum or glass and determine how many pounds the class needs to collect and recycle to pay for the field trip. Explain how you found your answer.