The production department is proposing the purchase of an automatic insertion machine. It has identified three machines and has asked the accountant to analyze them to determne the best average rate of return. Which machine has the best average rate of return? Machine A Machine B Machine Estimated average annual income $46,593.96 $68,880.60 $65,923.65 Average investment $332,814,00 $229,602.00 $439,491.00 a Machine A or B Ob Machine Oc. Machine A Od Machine