在javascript中卡住了我

base

marukup %

total amount

amount=base+((base/100)*markup

math.round

amount=math.round(base+((base/100)*markup).toFixed(2)

121

5%

amount

127.05

127

toFixed(n)

Math.round

total = function (base, markup) { return (base + (base * markup / 100)); }; 
amount = total(121,5).toFixed(2);

amount=(base+((base/100.toFixed(2))*markup).toFixed(2)