Question

The list price of a frock is Rs 220. A discount of 20% is announced on sales. The sale price in Rs. is (Answer in numbers)

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Answer 1

Marked price (M.P.) is same as the list price.

20% discount means that on Rs. 100 (M.P.), the discount is Rs. 20.

By unitary method, which is used for solving a problem by finding the value of a single unit, i.e., 1, (by dividing) and then finding the necessary value by multiplying the single unit value.

On Re. 1 the discount will be Rs. $\frac{20}{100}$
On Rs. 220, discount = Rs. $\frac{20}{100}\times 220$ = Rs. 44

$\therefore$ The sale price = Listed price - Discount
= Rs. 220 - Rs. 44
= Rs. 176

Alternative:

A discount of 20% means for M.P. of Rs 100, the discount is Rs. 20.
Hence, the sale price is Rs. 80.

Using unitary method, when M.P. is Rs. 100, sale price is Rs. 80
When M.P. is Re 1, sale price is Rs. $\frac{80}{100}$
Hence, when M.P. is Rs. 220, sale price = Rs. $\frac{80}{100}\times 220$ = Rs. 176.