a) X% of Y
b) 20% of XY
c) 2% of XY
d) 2% of 100 XY
Answer: c
Explanation:
$$\eqalign{
& {\frac{{XY}}{{100}}} + {\frac{{YX}}{{100}}} \cr
& = \frac{{2XY}}{{100}} \cr
& = 2\% \,of\,XY \cr} $$
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