Question : On selling 15 balls for INR 450, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:
Option 1: INR 23
Option 2: INR 54
Option 3: INR 45
Option 4: INR 32
Correct Answer: INR 45
Solution :
Selling Price of 15 balls = 450
Loss = Cost Price of 15 balls – Selling Price of 15 balls
⇒ Cost Price of 5 balls = Cost Price of 15 balls – 450
⇒ Cost Price of 10 balls = 450
⇒ Cost Price of 1 ball = $\frac{450}{10}$ = 45
Hence, the correct answer is 45.
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