The expected average rate of return for a proposed investment of $6,210,000 in a fixed asset, using straight-line depreciation, with a useful life of 20 years, no residual value, and an expected total net income of $18,630,000 over the 20 years is (round to two decimal points).

a.30.00%

b.60.00%

c.1.50%

d.15.00%