30–71
investment projects in each successive rate of return range down to and including the 0–5
percent range. If the real interest rate is 15 percent, what amount of investment will be
undertaken?
130. Assume that for the entire business sector of a private closed economy, there are $0 worth
of investment projects that will yield an expected rate of return of 25 percent or more. But there
are $15 worth of investments that will yield an expected rate of return of 20–25 percent,
another $15 with an expected rate of return of 15–20 percent, and an additional $15 of
investment projects in each successive rate of return range down to and including the 0–5
percent range. If the real interest rate is 5 percent, what amount of investment will be
undertaken?
131. Assume that for the entire business sector of a private closed economy, there are $0 worth
of investment projects that will yield an expected rate of return of 25 percent or more. But there
are $15 worth of investments that will yield an expected rate of return of 20–25 percent,
another $15 with an expected rate of return of 15–20 percent, and an additional $15 of