An investor has $ 5 to spend. there investments are being considered, each having an expected annual interest rate. the interest rates are 15, 10 & 18 percent respectively. the investor`s goal is an average return of 15 percent in the three investments. because of the high return on investment alternatives, the investor wants the amount in this alternative to equal 40 percent of the total investment. determine whether there is a meaningful investment strategy which will satisfy these requirements. (by crammer rule)