The cost price of 25 books is equal to the selling price of 20 books. The profit percent is
Let C.P. of 1 book = $$Rs.$$ $$x$$ and S.P. = $$Rs.$$ $$y$$
=> C.P. of 25 books = S.P. of 20 books
=> $$25x=20y$$
=> $$5x=4y$$
=> $$\frac{y}{x}=\frac{5}{4}$$
Let $$y=5$$ and $$x=4$$
$$\therefore$$ Profit % = $$\frac{y-x}{x} \times 100$$
= $$\frac{5-4}{4} \times 100$$
= $$\frac{100}{4}=25\%$$
=> Ans - (D)
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