Question

By selling 20 pen ,a shopkeeper loses equal to the cost price of 4 pens calculate his loss per cent​

Answer 1

Given:

By selling 20 pens, a shopkeeper's gain is equal to the selling price of 4 pens

So,

• 20(Selling price Cost price)= 4 Selling price
• 5 (Selling price - Cost price ) = Selling price
• 5 Selling price - 5 Cost price = Selling price
• 4 Selling price = 5 Cost price
• Selling price = 5 cost price /4

So,

Gain Selling price Cost price = 5 Cost price/4 Cost price = 5 Cost price - 4 Cost price $\frac{1}{4}$

$\frac{1}{4}$ Cost price Gain %

$\frac{1}{4}$ Cost price/ Cost price x 100 $\frac{100}{4}$ = 25%

ANSWER= 25%