A) \[{{a}_{1}}:{{a}_{2}}::{{b}_{1}}:{{b}_{2}}\]
B) 12%
C) 11%
D) 13.2%
Correct Answer: A
Solution :
He is gaining C.P. of 100 grams on every 900 grams. So, gain% \[=\frac{100}{900}\times 100=11\frac{1}{9}%\]
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