A discount on part of the bill — Caselets Aptitude Question
A discount on part of the bill: A restaurant bill comes to ₹2,400. A 20% discount applies to the food portion of… Answer and worked solution on CodeKairo.
- Topic: Caselets
- Section: Data Interpretation
- Difficulty: Medium
- Time target: 90 seconds
Question
A restaurant bill comes to ₹2,400. A 20% discount applies to the food portion of ₹1,500, and the rest of the bill is charged in full.
What is the final amount payable?
Options
- ₹1,920
- ₹2,100
- ₹2,160
- ₹2,280
Show the answer and the worked solution
Correct answer: B. ₹2,100
Worked solution
- Discounted food = 1,500 × 0.80 = ₹1,200.
- Remaining charges = 2,400 − 1,500 = ₹900, charged in full.
- Total = 1,200 + 900 = ₹2,100.
Answer: ₹2,100.
The idea
Split the bill into the discounted and undiscounted parts before applying anything. Discounting the whole ₹2,400 gives ₹1,920, the offered trap.
Shortcut. Take the discount off the bill in one step: 20% of 1,500 is 300, and 2,400 − 300 = ₹2,100.
Common trap. ₹1,920 — discounting the whole ₹2,400 by 20%; only the ₹1,500 food portion gets the discount.