Question

When the price of pair of shoes is decreased by 10% the number of pairs sold increased by 20% .what is the net effect on sales

Answer 1

Answer:

Step-by-step explanation:

Let the original price be Rs. 100

Let 100 be original price

Increase in pair = 20 = 100+20 = 120%

Decrease in price = 10 = 100-10 = 90%

Price = 120/100*(90/100*100)  =108;  

Increase Percentage = (8/100)*100

Answer 2

Answer:

The net effect on sale is it increased by 8%.

Step-by-step explanation:

If the price of shoes is decreased by 10%

and the number of pairs sold increased by 20% .

If there is a decrease in some quantity by a% and increase in other by b% then the net effect is calculated by:

$-a+b-\dfrac{a\times b}{100}$

Hence, the net effect on sale is judged by:

$-10+20-\dfrac{10\times 20}{100}\\\\10-2\\\\=+8$

          This means that the net effect on sale is:

                   It increased by 8%.