A 20% fall in the price of tomatoes lets Deepa buy 3 kg more tomatoes for ₹240. What was the original price of tomatoes per kg?

Explanation

1. 01

   A 20% fall saves 20% of ₹240 = ₹48 on the old quantity.

2. 02

   That ₹48 buys the extra 3 kg at the new price, so new price = $\frac{48}{3} = ₹16$ per kg.

3. 03

   New price = 80% of original, so original = $\frac{16}{0.8} = ₹20$ per kg.