Question

I thought 70 people would turn up to the concert, but in fact 80 did. Find the error.

• A. $21.5\%$
• B. $12.5\%$
• C. $13.5\%$
• D. None of these

Answer 1

The correct option is B $12.5\%$

$\frac{|ApproximateValue-ExactValue|}{|ExactValue|}\times 100$

$\frac{|70-80|}{80}\times 100$ = $\frac{10}{80}\times 100$

$\frac{100}{8}$ = $12.5$