Refer to the information in Exercise 14-30. In computing ROI, this division uses end-of-year asset values. Assume that all cash flows increase 10 percent at the end of each year. This has the following effect on the assets' replacement cost and annual cash flows:
$$
\begin{array}{cccc}
\text{End of Year} &\text{Replacement Cost}&\text{Annual Cash Flow}\\
1 \ldots \ldots & \$ 60,000,000 \times 1.1=\$ 66,000,000 & \$ 15,000,000 \times 1.1=\$ 16,500,000 \\
2 \ldots \ldots & \$ 66,000,000 \times 1.1=\$ 72,600,000 & \$ 16,500,000 \times 1.1=\$ 18,150,000 \\
3 \ldots \ldots & & \text { Etc. } & \text { Etc. }
\end{array}
$$
Depreciation is as follows:
$$
\begin{array}{lrc}
\text { Year } & \text { For the Year } & \text { "Accumulated" } \\
1 \ldots \ldots \ldots & \$ 6,600,000 & \$ 6,600,000(=10 \% \times \$ 66,000,000) \\
2 \ldots \ldots & 7,260,000 & 14,520,000(=20 \% \times 72,600,000) \\
3 \ldots \ldots & 7,986,000 & 23,958,000 \\
4 \ldots \ldots & 8,784,600 & 35,138,400
\end{array}
$$
Required
a. Compute ROI using historical cost, net book value.
b. Compute ROI using historical cost, gross book value.
c. Compute ROI using current cost, net book value.
d. Compute ROI using current cost, gross book value.