GWD 18-24

[uioxcv]

請教一下~Q24:
The positive numbers w, x, y, and z are such that x is 20 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 ?

A. 15.2%
B. 16.0%
C. 20.0%
D. 23.2%
E. 24.8%

答案A~~怎嚜算的>"<

[reohuang]

x=1.2y
y=1.2z
w=0.8x

w=0.8x=0.8*1.2y=0.8*1.2*1.2z=1.152z
therefore w is 15.2% greater than z

for your reference