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.
9 lemons for ₹18.45 or 7 lemons for ₹15.40 ?

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Solution

The cost of 9 lemons = ₹18.45
$∴$ The cost of such type of 1 lemon = $\frac{₹ 18.45}{9} = ₹ 2.05$
The cost of the second type of 7 lemons = ₹15.40
$∴$ The cost of the second type of 1 lemon = $\frac{₹ 15.40}{7} = ₹ 2.2$
The cost per lemon of the first type is ₹2.05 and for the second type is ₹2.2
So, the better buy is 9 lemons for the cost of ₹18.45.

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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. 9 lemons for ₹18.45 or 7 lemons for ₹15.40 ?

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.
9 lemons for ₹18.45 or 7 lemons for ₹15.40 ?