The firm is offered a loan in the amount of 300015 The loan must be repaid in 3 installments, 1000$ in the fint year, 2000 in the second two years, and 2000$ in 3 years A) what is the interest rate for the period embedded in the loan . B) Calculate for r=0%, r = 10%, r = 80% the loan interest rate and determine at what rates the investment in terest is worthwhile