You purchase 8 gallons of paint and 3 brushes for $152.50. The next day, you purchase 6 gallons of paint and 2 brushes for $113. How much does each gallon of paint and each brush cost?

a. Write a system of equations to describe this scenario.

b. What is the cost per gallon of paint and brush?

c. How much would it cost to purchase 4 gallons of paint and 1 brush?