The expected average rate of return for a proposed investment of $636,700 in a fixed asset with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total income of $166,360 for the 4 years is (round to two decimal places) Oa. 13.06% Ob. 6.53% Oc. 0.52% Od. 0.26%