Question

The cost of a pound of nails increased from $2.12 to $2.26. What is the percent of increase to the nearest whole-number percent?The percent of increase is %. (Type an integer.)

Answer 1

Set

$\begin{gathered} 2.12\rightarrow100\% \\ 2.26\rightarrow x\% \end{gathered}$

which is equivalent to

$\frac{100}{2.12}=\frac{x}{2.26}$

Solving for x,

$\Rightarrow x=\frac{226}{2.12}=106.60377...\approx107$

Then 107-100=7%. Therefore, the percentage of increase is 7%