RRB Group D 24-Sep-2018 Shift 1 Solved Paper

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Question : 55 of 100

Marks: +1, -0

A man buys 5 pens for 1 rupee and sells 4 for 1 rupee. Find his gain percent.

$25 \%$
$20 \%$
$40 \%$
$50 \%$

Solution:

5 pens for

\Rs.1

and 4 pens for

\Rs.1

by shortcut method

\⇒

x=5, y=1, z=4, w=1

\∴

Profit

\%={x w-z y}/{z y} \×100 \%

={5 \× 1-4 \×1}/{4 \×1} \×100

={5-4}/{4} \× 100

Profit

\%={1}/{4} \×100 \⇒ 25 \%

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