Question

Susan tries to read 50 pages of her book every day. One week (7 days) she only managed to read 280 pages. What was the percentage error?

• A. $25\%$
• B. $15\%$
• C. $2.5\%$
• D. None of these

Answer 1

The correct option is A $25\%$

$\Rightarrow$ Here, Approximate value of pages for one week = $50\times 7=350$

$\Rightarrow$ Exact value is $280$

$\Rightarrow$ $\%Error=\frac{|Approximatevalue-Exactvalue|}{|Exactvalue|}\times 100$

$\Rightarrow$ $\%Error=\frac{|350-280|}{280}\times 100$

$\Rightarrow$ $\%Error=\frac{70}{280}\times 100=25\%$