The price after 20% discount is Rs 400. What was the original price?
A
Rs 480
B
Rs 500
C
Rs 520
D
Rs 540
Correct Answer: Option B — Rs 500
Explanation:
0.8P = 400 → P = 500. Finding the original price before discount requires dividing by (1 - discount rate). Adding 20% to 400 gives the wrong answer. This is a common trap in competitive exams. Always divide by the remaining percentage fraction to find the original pre-discount price.