Correct Answer - Option 4 : 125
Given:
The cost price of 150 pens is equal to the selling price of a certain number of pens.
The profit is 20%.
Formula used:
Profit or Gain = Selling price – Cost Price
Loss = Cost Price – Selling Price
Profit percentage = (Profit /Cost Price) × 100
Loss percentage = (Loss / Cost price) × 100
Calculation:
Let the number of pens sold be x.
CP of 150 = SP of x
Let CP of one pen be Rs. 10.
SP = Rs. (1.2 × 10) = Rs. 12
CP of 10 = SP of x
⇒ 150 × 10 = 12 × x
⇒ x = 125
∴ required number of pens sold is 125
