Which of the following is considered as dis-advantage for payback period: Select one: O a. it accounts for the need to recover capital quickly b. it ignores the expected service life c. it is very easy to calculate O d. the future is unknown The equivalent annual worth of an increasing arithmetic gradient is $135,300. If the cash flow in year 1 is $35,000 and the gradient amount is $19,000, what is the value of n at an interest rate of 10% per year? Select one: O a. n = 15 years O b. n = 20 years c. n = 25 years d. n = 35 years