Question

A shopkeeper has 400 pens and one third of it is sold not at profit and not at loss . But the remaining pens are soldat a profit of Rs 45 then what is the cost of all pens.
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Answer 1

Answer:

15 percentage

Step-by-step explanation:

Assume that price of the pen is X

Initial Cost = 300 * X = 300X

As per given equation,number of pens sold at no profit/loss = 300 *( 1/4) = 75

Remaining pens sold at 20% profit = (300–75) * (X+X*(0.2)) = 270X

Total Profit = (75X + 270X) - 300X = 45X

Profit Percentage = (profit/Initial Cost) * 100 = (45X/300X ) * 100 = 15

So there is profit of 15% on whole transaction.

Answer 2

Answer:

Total pens =400

let cost of 1 pen = ₹ x

1/3 rd of pens = 400/3 = 133 pens

cost of 133pens = ₹ 133x

remaining pens = 400-133 = 267

profit =₹45 , profit% = profit /cp ×100 = 45/267x ×100