What would be the effects of the following on the investment demand function illustrated in Table 21-5 and Figure 21-8?
a. A doubling of the annual revenues per $1000 invested shown in column (3)
b. A rise in interest rates to 15 percent per year
c. The addition of a ninth project with data in the first three columns of (J, 10, 70)
d. A 50 percent tax on net profits shown in columns (6) and (7)