Question

Approximately 30 million mobile devices were sold in 1998 in the United States. The number sold increased to 180 million devices in 2007. Calculate the percent increase of mobile device sales from 1998 to 2007.

Answer 1

Number of mobiles sold in the year 1998=30 million

Number of mobiles sold in the year 2007=180 million

Percentage increase in mobile sale from year 1998 to 2007 will be

`=\frac{\text{final}-\text{Initial}}{\text{Initial}}\\\\=(180-30)/(30)*100\\\\=(150)/(30) * 100\\\\=(15000)/(30)\\\\=500\text{Percent}`

=500%

Answer 2

500%

Explanation:

The percentage change is given by ...

percent change = ((new value)/(old value) -1) × 100% = (180/30 -1)×100%

= (6 -1)×100% = 500%

Mobile device sales increased 500% from 1998 to 2007.