please provide a full solution for each step

A large producer of house products purchases a glyceride used in one of its deodorant soaps from outside of the c uses the glyceride at a fairly steady rate of C pounds per month, and company uses an int(5+C/20) percent annual interest rate to compute inventory holding costs. The chemical can be purchased from two suppliers: A and B. A offers the following all-unit discount schedule: 0SQ 700 700 sQ 1400 13 2 1400Q whereas B offers the following incremental discount schedule 0sQ 800 12 800 sQ