Question

marks
Priyanka went to a super market. At an
average price of Rs 80 she purchased 20
cosmetic items. She was surprised to hear an
offer of 10% discount on all items. Find the
average price per item after discount.
Rs 88
Rs 72
Rs 68​

Answer 1

Answer:

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Answer 2

Answer:

The average price per item after discount is 72 rupees.

Step-by-step explanation:

Given, Priyanka purchased total 20 cosmetic items and average price all of them was 80 rupees.

So,total cost of all cosmetic

$= (20 \times 80) \\ = 1600 \: rupees$

Now she got 10% discount.

After discount,she spend total

$= \frac{100 - 10}{100} \times 1600 \\ = \frac{90}{100} \times 1600 \\ = 90 \times 16 \\ =1440 \: rupees$

Therefore average price of per cosmetic item after discount

$= \frac{1440}{20} \\ = 72 \: rupees$

This is a problem of Algebra.

Some important Algebra formulas.

(a + b)² = a² + 2ab + b²

(a − b)² = a² − 2ab − b²

(a + b)³ = a³ + 3a²b + 3ab² + b³

(a - b)³ = a³ - 3a²b + 3ab² - b³

a³ + b³ = (a + b)³ − 3ab(a + b)

a³ - b³ = (a -b)³ + 3ab(a - b)

a² − b² = (a + b)(a − b)

a² + b² = (a + b)² − 2ab

a² + b² = (a − b)² + 2ab

a³ − b³ = (a − b)(a² + ab + b²)

a³ + b³ = (a + b)(a² − ab + b²)

Know more about Algebra,

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