The positive numbers w, x, y, and z are such that x is 35 percent greater than y, y is 20 percent greater than z, and w is 20 percent less than x. What percent greater than z is w ?	Choose the correct choice from the following choices:
A) 15.2%
B) 16.0%
C) 20.0%
D) 23.2%
E) 24.8%
My strategy is same as theDobermanbut instead take z=100, which makes life a bit easy. As:   z=100   y=120 (20% greater than z)   z=144(20% greater than y)   Now calculate w 20% less than z = 144*80/100= 
<gadget id="calculator">144*80/100</gadget>
<output>576/5 = around 115.2</output>
115.2   Now by just looking, relation between w and z:   w-z/z*100= 20 - Answer 20.0%
<result>C</result>
The positive numbers w, x, y, and z are such that x is 35 percent greater than y, y is 20 percent greater than z, and w is 20 percent less than x. What percent greater than z is w ?