The following table gives the sales of an electronic chip over 5 years. Find the year in which the sales are equal to the average of the sales over the 5 years.
| Years | 2015 | 2016 | 2017 | 2018 | 2019 |
| Sales (in thousand of rupees) | 45 | 54 | 57 | 60 | 69 |
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 2017.
Average of 5 years = Sales of all years/Total years = (45 + 54 + 57 + 60 + 69)/5 = 285/5 = 57
Sales of 2017 are equal to the average of the sales over the 5 years