Shortcut Trick
Use the direct ratio relation: CP / MP = (100 − Discount%) / (100 + Profit%).
CP / MP = (100 − 15) / (100 + 30) = 85 / 130 = 17 / 26.
If no discount is given, the Marked Price becomes the Selling Price.
New Profit = 26 − 17 = 9 units.
Profit % = (9 / 17) × 100 = 52.94%.
∴ The correct answer is 52.94 percent.
Alternate Method
Given:
Selling Price (SP) of one article = ₹60
Discount = 15%
Profit = 30%
Formula Used:
Marked Price (MP) = SP / (1 − Discount%)
Cost Price (CP) = SP / (1 + Profit%)
Profit % = [(SP − CP) / CP] × 100
Calculations:
⇒ MP = 60 / 0.85 = 6000 / 85 = 1200 / 17
⇒ CP = 60 / 1.3 = 600 / 13
⇒ If no Discount is given, New SP = MP = 1200 / 17
⇒ New Profit = (1200 / 17) − (600 / 13)
⇒ New Profit % = [((1200 / 17) − (600 / 13)) / (600 / 13)] × 100
⇒ New Profit % = [((1200 / 17) / (600 / 13)) − 1] × 100
⇒ New Profit % = [(2 × 13 / 17) − 1] × 100
⇒ New Profit % = [26 / 17 − 1] × 100 = (9 / 17) × 100
⇒ New Profit % = 52.9411...% ≈ 52.94%
∴ The correct answer is 52.94 percent.
Additional Information
CP and MP Relation
The ratio of Cost Price to Marked Price is always given by CP / MP = (100 − D%) / (100 + P%).
Marked Price (List Price)
It is the price displayed on the product. Discount is always calculated on the Marked Price.
Successive Discounts
If two discounts d1 and d2 are given, the Effective Discount is d1 + d2 − (d1 × d2 / 100).