Question

The unitary method can be used to compare the price of two similar things and then find out which one will be better to buy.
Find, which is a better buy : 3 kg oranges for ₹75 or 5 kg oranges for ₹150?

Answer 1

The cost of 3 kg oranges = ₹75
$\therefore$Cost of such 1 kg orange = $\frac{₹75}{3}=₹25$
The cost of 5 kg of oranges of different types = ₹150
$\therefore$ Cost of such 1 kg of orange = $\frac{₹150}{5}=₹30$
The cost per kg for the first type of orange is ₹25 and of the second type is ₹30
So, better buy is 3 kg oranges for ₹75.