The production department is proposing the purchase of an automatic insertion machine. It has identified 3 machines and has asked the accountant to analyze them to determine the best average rate of return. Estimated average annual income Average investment Oa. Machine C Ob. Machine B Oc. Machine A Od. Machine A or B Machine A Machine B Machine C $45,697.96 $64,744.20 $62,911.65 $326,414.00 $215,814.00 $419,411.00