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. - Mathematics

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Sum

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.

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Solution

Let the original cost = ₹100

Increased by 20%

∴ New cost = 100 + 20  = ₹120

Decreased by 30% = `(120 xx 30)/(100)` = ₹36

∴ New cost = 120 - 36 = ₹84

Overall change = 100 - 84 = ₹ 16

Required percentage = `(16)/(100) xx 100` = 16% decrease

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Chapter 7: Percent and Percentage - Exercise 7 (A) [Page 83]

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Selina Concise Mathematics Class 8 ICSE
Chapter 7 Percent and Percentage
Exercise 7 (A) | Q 19 | Page 83

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