On a tool whose marked price is Rs.280, a discount of 15% is offered. Due to a calculation mistake, the shopkeeper gives the customer Rs.20 extra. What is the effective discount percentage on the tool for the customer?
Show answer & explanation
Correct answer: A
Explanation
The Correct answer is option 1 i.e. 22.1%.
Marked price of the tool = Rs. 280
Discount = 15%
Selling price = Marked price × (100 - discount%)/100
= 280 × (100 - 15)/100
= Rs 238
Due to a calculation mistake, the shopkeeper gives the customer Rs.20 extra.
So, the selling price = 238 - 20 = 208
So, the effective discount percentage:
⇒ 218 = 280 × (100 - discount%)/100
⇒ 2180 = 28 × (100 - discount%)
⇒ 77.85 - 100 = discount%
discount% = 22.14%