How much should you invest at 2.68 simple interest in order to earn $90 interest in 20 months? You should show your work for this question. Samuel and Wendy have a new grandson. How much money should they finvest now so that he will have 572,000 for his college education in 18 years? The money is invested at 6.48 compounded annually. You should show your work for this question. You deposit $6000 in an account earning 7% interest compounded monthly. How much will you have in the account in 15 years? You should show your work for this