Correct Answer - Option 3 : 42.85%
Ans: 3
Given:
Cost price for one pen is = 28 Rs.
Selling price for one pen is = 40 Rs.
Formula used:
Profit percent = \(\frac{{selling\;price - cost\;price}}{{cost\;price}}\) × 100
Calculation:
Cost price for one pen is = 28 Rs.
Selling price for one pen is = 40 Rs.
difference between selling price and cost price = 40 - 28 = 12 Rs.
profit percent = \(\frac{{12}}{{28}}\) × 100 = 42.85%
∴ Profit percent for the shopkeeper is 42.85%.