Answer:
b. interest rate per period
Explanation:
There are following terms while calculating the present value, future value, number of years, monthly payments, interest rate etc
Like
Present value = PV
Future value = FV
Number of years = n
Interest rate per period = i
Monthly payments = P or PMT
So in the given options, the second option is correct
Plus we can find out the PMT by using the excel i.e
= PMT(Rate,NPER,PV,FV,type)
The present value or future value come in negative as the case may be