Question

The number of iPhones sold in a small town was 2800 in 2011.

In 2012 there was an increase in sales of iPhones in the town by 30%. Over the next 12 months,
the sales of iPhones in the town decreased by 15%.
What is the overall sales percentage increase or decrease over the two-year period?

Answer 1

overall sales percentage = 10.5% increase

Explanation:

• In 2012, there was a 30% increase in sales compared to 2011.
• Increase = 30% of 2800Increase = 0.30 * 2800
• Increase = 840 iPhones

• Sales in 2012 = 2800 (2011 sales) + 840 (increase)
• Sales in 2012 = 3640 iPhones

• There was a 15% decrease in sales from 2012 to 2013.
• Decrease = 15% of 3640
• Decrease = 0.15 * 3640
• Decrease = 546 iPhones

• Sales in 2013 = 3640 (2012 sales) - 546 (decrease)
• Sales in 2013 = 3094 iPhones

• Overall Change = Sales in 2013 (3094) - Sales in 2011 (2800)
• Overall Change = 3094 - 2800
• Overall Change = 294 iPhones

• Overall Percentage Change = (Overall Change / Sales in 2011) * 100
• Overall Percentage Change = (294 / 2800) * 100
• Overall Percentage Change ≈ 10.5%