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The expected average rate of return for a proposed investment of $646,400 in a fixed asset with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total income of $217,280 for the 4 years is (round to two decimal places) Oa. 0.34% Ob. 16.81% Oc. 0.67% Od. 8.40% The amount of the average investment for a proposed investment of $199,000 in a fixed asset with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total income of $30,500 for the 4 years is Oa. $7,625 Ob. $30,500 Oc. $49,750 Od. $99,500