Eed to produce 100 units of a final assembly, c assembly c is composed of 2 subassemblies, a and b final assembly c has defect rate of 3% four (4) pieces of sub-assembly a are needed for the final product c sub-assembly a has a defect rate of 6% three (3) pieces of sub-assembly b are needed for the final product c sub-assembly b has a defect rate of 5%