If selling price of 39 articles is equal to the cost price of 42 articles, then what will be the profit percentage?
Let cost price of 1 article = Rs. $$x$$ and selling price = Rs. $$y$$
According to ques, => $$39y=42x$$
=> $$\frac{y}{x}=\frac{42}{39}$$
Let $$x=39$$ and $$y=42$$
Thus, profit % = $$\frac{(y-x)}{x}\times100$$
= $$\frac{(42-39)}{39}\times100$$
= $$\frac{300}{39}=7.69\%$$
=> Ans - (B)
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