please answer using excel and explain

3) You have $1,250 today and would like to know how long it will take you to double your money. Assume that you can earn 9% per year on your investment. Use Excel's =NPER(RATE,PMT,PV, [FV],[TYPE]) function. RATE is 9%,PMT is $0,PV is $1,250, FV is $2,500, and TYPE is 0 since payments are made at the end of the period. If the [type] argument is omitted, it takes on the default value of 0