If A = <i class="ga-var">x</i>% of <i class="ga-var">y</i> and B = <i class="ga-var">y</i>% of <i class="ga-var">x</i>, then which of the following is true?

Correct Answer: None of these
$$\eqalign{ & x\% \,{\text{of}}\,y = {\frac{x}{{100}} \times y} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\frac{y}{{100}} \times x} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = y\% \,{\text{of}}\,x \cr & \therefore A = B \cr} $$