Question

Mary expected to $120$ people for her wedding, but only $60$ people appeared. What was the percentage error?

• A. $75\%$
• B. $25\%$
• C. $55\%$
• D. $100\%$

Answer 1

The correct option is D $100\%$

Given, absolute value $=120$ and exact value $=60$

We know, percentage error $=$ $\left|\frac{\text{Absolute value}-\text{exact value}}{\text{exact value}}\right|\times 100$ $\%$
$=$ $\left|\frac{120-60}{60}\right|\times 100$ $\%$
$=$ $\left|\frac{60}{60}\right|\times 100$ $\%$
$=$ $\left|1\right|\times 100$ $\%$
$=100\%$