Question

19. The cost of an article is first increased by 20%
and then decreased by 30%, find the
percentage change in the cost of the article.​

Answer 1

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Question - The cost of an article is first increased by 20%

and then decreased by 30%, find the

percentage change in the cost of the article

Answer - Find the attachment

Formula used -

Percentage change= Old number - New number / Old number *100

Answer 2

Answer:

10% Decrease

Step-by-step explanation:

Let the cost price of the article be 100.

Now, Increase in price is 20%.

Therefore, increase in price is

100 + 20/100 * 100 = 20

Therefore new price = 120

Now, Decrease in price is 30%.

Therefore decrease in price is

120 - 30/100 * 100 = 90

Percentage Change = Change/Actual Price *100 Change = 10, Actual Price = 100

Therefore, Change = 10/100 * 100 = 10%

Therefore change is equal to 10 per cent and there is 10 per cent decrease in price.