Question

Jill calculates the cost of a book as $50.the actual price was $56. what is jill's percent error?

Answer 1

$E=\frac{|x-x_r|}{x_r}\times100$

where x is the estimated value and xr the real value

$\begin{gathered} E=\frac{|50-56|}{56}\times100 \\ \\ E=\frac{|-6|}{56}\times100 \\ E=\frac{6}{56}\times100 \\ E=10.71 \end{gathered}$

the percent error is 10.71%