If interest is $7\%$ compounded annually, calculate the present value of four year cash flows of $$10,000$ in year $1$;$$20,000$ in year $2$;$$30,000$ in year $3$ and

$$40,000$ in year $4.$

Multiple Choice

$$83,819\mathrm{.}31$

$$82,819\mathrm{.}31$

$$84,819\mathrm{.}31$

$$80,819\mathrm{.}31$

$$81,819\mathrm{.}31$