please provide solutions

Let us say that you are the Purchasing Manager for Lion King Electronics, a company that manufatures scanners and other computer peripherals. Your vendor for scanner motors, ABD Industries, is now offering "quantity discounts" in the form of instant rebates and lower shipping charges as follows: Per motor Net Price (PhD) 800 800 800 Quanity 1 - 500 motors 501 - 1,000 motors 1,001 - 2,000 motors Rebate (PhP) None 60 90 Shipping (PhP) 65 45 30 a. b. Calculate the cost of the motors, including shipping charges, for each category. If you usually purchase 400 motors per month, what percent would be saved per motor by ordering 800 every two months? What percent would be saved per motor by ordering 1,200 every three months? How much money can be saved in a year by purchasing the motors every three months instead of every month? c. d. Solution and