if x is r percent of y and if k is s percent y, then x is what percent of k?

Question

100(r+s)%
100/rs%
100r/s%
100s/r%
rs/100%

Answer 1

x/y = 100r
k/y = 100s

y = x/100r = k/100s
so,
x/k = 100r/100s = r/s
or 100r/s%