Java API for calculating percent -

i'm having troubles finding java api calculate percentages.

eg.

assert theapi.percentofnumber(10.0, 200.0) == 20.0 assert theapi.percentofnumber(25.0, 200.0) == 50.0

i know it's easy calculate, want find api it.

here is

public static double percentofnumber(double x, double y) {     return x * 100 / y; }

note, method name longer code have write.

say want calculate percentage of x in 200, can simplify further.

double tenin200 = 10 / 2.0 double twentyfivein200 = 25 / 2.0;

btw answer should be

assert percentofnumber(10.0, 200.0) == 5.0; assert percentofnumber(25.0, 200.0) == 12.5;

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