(100−y)(100+p)(100-y)\over(100+p) (100+p)(100−y)
100y(100+p)100y\over(100+p)(100+p)100y
(100−y)100p(100-y)\over100p 100p(100−y)
y(100−y)(100+p)y(100-y)\over(100+p)(100+p)y(100−y)