Question : The below table shows the number of music systems that were sold by two companies in the years 2014 to 2017. What is the difference between the average sales of company A and company B?
| Year | Company A | Company B |
| 2014 | 5640 | 6980 |
| 2015 | 8412 | 10512 |
| 2016 | 7148 | 8620 |
| 2017 | 8424 | 10020 |
Option 1: 7406
Option 2: 1627
Option 3: 2016
Option 4: 9033
Correct Answer: 1627
Solution :
Average sale of company A = $\frac{5640+8412+7148+8424}{4}$ = 7406
Average sale of company B = $\frac{6980+10512+8620+10020}{4}$ = 9033
The difference = (9033 – 7406) = 1627
Hence, the correct answer is 1627.
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