Question

A man sold 40 pens for 90 rupees and gained 25 ℅ how many pens could he buy for 90

Answer 1

it is not the que of business studies

you can use the formula of profit percent.....

Answer 2

Answer:

Given,

SP of 40 pens = rs 90

SP of 1 pen = 9/4 = rs2.25

Gain = 25%

To find : no of pens for rs 90

Explanation:

$cp \: = \frac{100}{100 + gain} \times sp$

$cp = \frac{100}{100 + 25} \times 2.25$

$cp = \frac{100}{125} \times 2.25$

$cp = \frac{9}{5} = rs \: 1.8$

cp of 1 pen = rs 1.8

cp of 90 pens = 1.8 × 90

cp of 90 pens = rs 162