Question

If the cost price of 21 articles is equal to the selling price of 18 articles , then the gain percentage is​

Answer 1

$\mathcal{\huge{ANSWER:}}$

$\mathbb{GIVEN}$

= cp of 21 articles = sp of 18 articles

$\mathbb{GAIN}$

= let the cp of 1 article = rs.1

cp of 21 articles = rs.21

cp of 18 articles = rs.18

sp of 18 articles = rs.21

gain = rs.3

gain per cent = $\frac{gain}{cp}$×100

= $\frac{3}{18}$×100

= 16.66%