Trina's toy company charges $0.85 per pound to ship toys.

part a: write an equation to determine the total cost, c, to ship p pounds of toys. use your equation to determine the cost of shipping 2 pounds of toys.

part b: if the company reduces the cost to ship toys by 0.05 per pound, write an equation to determine the total cost, c, to ship p pounds of toys with the reduced cost.

i mainly don't understand part b- but i need explanation for part a still.