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The expected average rate of return for a proposed investment of $$6,210,000$ in a fixed asset, using straight$-$line depreciation, a useful life of $20$ years, no residual value, and an expected total income of $$12,420,000$ over the $20$ years, is $($round to two decimal places$)$

a$.10\mathrm{.}00\%$

b$.1\mathrm{.}00\%$

c$.20\mathrm{.}00\%$

d$.40\mathrm{.}00\%$