I need the solution for the problem below :)

Two alternative designs are under consideration for a tapered fastening pin. The fastening pins are sold for $0.7m each. Either design will serve equallyr well and will nvolve the same material and manufacturing cost except for the lathe and drill operations. Design A will require E hours of lathe time and 4.5 hours of drill time per LOUD units. Design B will require 7' hours of lathe time and 12 hours of drill time per 1,000 units. The variable operating cost of the lathe, including labor, is $13.50 per hour. The variable operating cost of the drill, including labor, is $15.90 per hour. a. Which design should be adopted if 125,000 units are sold per year? b. What is the annual saving over the other design