The expected average rate of return for a proposed investment of $638,400 in a fixed asset with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total income of $344,760 for the 4 years is (round to two decimal places) a. 27.00% Oa. Ob. 13.50% Oc.0.54% Od. 1.08%