a) c %
b) $$\frac{{{\text{ac}}}}{{\text{b}}}$$ %
c) $$\frac{{{\text{bc}}}}{{\text{a}}}$$ %
d) abc %
Answer: b
Explanation:
$$\eqalign{
& \frac{{ {ax} }}{{100}} = \frac{{ {by} }}{{100}} \cr
& ax = by \cr
& y = \frac{{ {ax} }}{b} \cr
& c\% \,{\text{of}}\,y = \frac{{ {cy} }}{{100}} \cr
& \frac{{ {cy} }}{{100}} = \frac{{ {cax} }}{{100b}} \cr
& c\% \,{\text{of}}\,y = \frac{{ca}}{b}\% \,{\text{of}}\,x \cr} $$
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