Jack deposited $20,000 in his saving account now. (a) What is the amount he will get after one year in his saving account if the account has a rate of return of 10% ? (b) Calculate the earned amount of interest. Problem 2 Which of the following 1 -year investments has the highest rate of return: $12,000 that yields $3,000 in interest, $40,000 that yields $5,000 in interest, or $80,000 that yields $4,000 in interest? Problem 3 A person borrowed $10,000 now and you plan to repay the loan in eight equal annual amounts starting one year from now with interest rate of 10% per year. Determine the engineering economy symbols and their value