Assume that for the entire business sector of the economy there is $1 worth of investment projects that will yield an

expected rate of return of 25 percent or more. But there are $9 worth of investments that will yield an expected rate

of return of 20-25 percent; another $14 with an expected rate of return of 15-20 percent; and similarly an additional

$21 of investment projects in each successive rate of return range down to and including the 0-5 percent range. refer to the above information. if the real interest rate is 15 percent, which amount of investment will be undertaken?