Question

a stationer buys pens at 5 for rs 28 and sells them at a profit of 25%,How much should a customer pay ;if he buys ( 1 ) only one pen (2) three pens

Answer 1

Answer:

7 for 1

21 for 3

Step-by-step explanation:

Cost price for 5 = 28

Cost price of1 = 28/5 = 5.6

Profit = (25/100)*5.6=1.4

Selling price of 1 = 5.6+1.4=7

Selling price of 3 = 3*7 = 21

Answer 2

The SP when he buys 1 pen is Rs 7

The SP when he buys 3 pen is Rs 21

Solution:

Given that,

A stationer buys pens at 5 for rs 28

Therefore,

Cost price of 5 pens = Rs 28

Then,

$\text{Cost price of 1 pen } = \frac{28}{5} = 5.6$

Profit = 25 %

Find the selling price of 1 pen

SP = cost price + 25 % of cost price

SP = 5.6 + 25 % of 5.6

$SP = 5.6 + \frac{25}{100} \times 5.6\\\\SP = 5.6 + 0.25 \times 5.6\\\\SP = 7$

Thus the SP when he buys 1 pen is Rs 7

Find the SP of three pens

SP of 3 pens = 7 x 3 = 21

Thus the SP when he buys 3 pen is Rs 21

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