How long will it take (in years and months), for $100 to double in value, if it earns interest at 4.39% compounded quarterly Round N to the next higher value (e.g. N = 123.2 becomes N = 124), and round the month to the next higher month (e.g. 7.1 becomes 8). Years must be an integer. If years is an exact integer such as 17 years 0 months, a zero must be entered for months. 1/4 = % P/Y = C/Y - PV = $ PMT = $ FV = N- Time = years and months