-- |All numbers in an n-series should be rounded to quarters
prop_quarters :: Double -> Double -> Int -> Property
prop_quarters fstNum growthRate len = len >= 0 ==> isQuarter $ seriesN fstNum growthRate len
prop_quarters :: Double -> Double -> Int -> Property
prop_quarters fstNum growthRate len = len >= 0 ==> isQuarter $ seriesN fstNum growthRate len
prop_quarters fstNum growthRate len = len >= 0 ==> isQuarter $ seriesN fstNum growthRate len