Question

A vacuum cleaner dealership sold 390 units in 2011 and 407 in 2012. Find the percent increase or decrease in the number of units sold.

Answer 1

`4.36\text{ \% increase}`

Step-by-step explanation:

Here, we want to get the percentage increase or decrease in the number of units sold

Since the number of units sold in 2012 is greater than the number of units sold in 2011, we have an increase

Mathematically, we can have the percentage increase or decrease as follows:

`\begin{gathered} \frac{Number\text{ of units sold in 2012 - Number of units sold in 2011}}{\text{Number of units in 2011}}\text{ = } \\ (407-390)/(390)\text{ }*\text{ 100 \%} \\ \\ =\text{ }(17)/(390)*\text{ 100 \% = 4.36\%} \end{gathered}`