Bus Econ 2.1.35 If 30 lb of rice and 30 lb of potatoes cost $28.80, and 20 lb of rice and 12 lb of potatoes cost $15.52, how much will 10 lb of rice

Bus Econ 2.1.35                 

If 30 lb of rice and 30 lb of potatoes cost ​$28.80​,

 and 20 lb of rice and 12 lb of potatoes cost ​$15.52​,

 how much will 10 lb of rice and 50 lb of potatoes​ cost?

The cost of 10 lb of rice and 50 lb of potatoes is ​$

​(Simplify.)