formula of percentage p of 3 values x,y,z
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Okay this reminds me of my school days, 6th grade.
The easiest way to approach this problem is to first notice that X<Y<Z
Since all they gave us in the question is a percentage, we have the freedom to pick any numbers. The easiest number to pick here is a 100 , since percentage deals in parts of 100 .
Let X=100
Y=X+20% of X=100+20% of 100=100+20=120
Z=Y+10% of Y=120+10% of 120=120+12=132
We require Z−XX×100%=132−100100×100=32%
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