Correct Answer - Option 2 : 16.67
Given :
Cost of 1 bar of chocolate is Rs 80
After discount price of 6 bars is Rs 400
Formula used :
Discount percent = [(marked price - selling price)/marked price] × 100
Calculations :
Cost of 6 chocolate bars = 6 × 80 = 480 rupees (cost of 1 bar is 80 rupees)
Cost of 6 chocolate bars after discount = 400 rupees
Effective discount = 480 - 400 = 80 rupees
Effective discount percent = (80/480) × 100
⇒ 100/6 = 16.67
∴ effective discount is 16.67%