Question : Study the given graph and answer the question that follows.
In 2020, the production of cement by company C increased by the same percentage as in 2019, over its previous year. The production (in million tonnes) of cement by company C in 2020 (correct to one decimal place) was:
Option 1: 454.6
Option 2: 455.8
Option 3: 457.1
Option 4: 452.4
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Correct Answer: 457.1
Solution :
Given:
Production of cement by company C in 2018 = 350 million tonnes
Production of cement by company C in 2019 = 400 million tonnes
Now,
Percentage increase of production from 2018 to 2019 = $\frac{400\ -\ 350}{350}\times 100= 14.28\%$
Production of cement by company C increased by the same percentage in 2020.
Production of cement by company C in 2020 = $400\ \times \frac{100\ +\ 14.28}{100}\ =\ 457.1$ million tonnes
Hence, the correct answer is 457.1 million tonnes.
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