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答案：
D
let's as
f1 = nb FT employee for div X
p1 = nb PT employee for div X
f2 = nb FT employee for div Y
p2 = nb PT employee for div Y
We are asked to show that:
f1/p1 > (f1+ f2)/(p1 + p2)
develop this inequation and we get:
f1p2 > f2p1
Stat.1 says: f2/p2 less then (f1+f2) divided by (p1+p2), develop it and we get f1p2 > f2p1 => stat.1 sufficient
stat.2 says: f1>f2 & p2>p1, multiply this and we get:
f1p2 > f2p1 => stat.2 is sufficient
Ans. is D
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