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The average of sales of furniture in the years 2015, 2016, 2017, 2018 is Rs. 16300 and that for years 2016, 2017, 2018, 2019 is Rs. 18450. If the sales in 2019 are 9200, then what are the sales in 2015?
1. 768
2. 560
3. 600
4. 865

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Correct Answer - Option 3 : 600

Given: 

The sale in 2019 = Rs 9200

Formula used:

Average = Sum of the total terms/Total number of the terms

Calculation:

The total cost of sale of furniture in 2015, 2016, 2017, 2018 = 16300 × 4 = 65200

The total cost of sale of furniture in 2016, 2017, 2018, 2019 = 18450 × 4 = 73800

The total cost of sale of furniture in 2016, 2017, 2018 = 73800 – 9200 = 64600

The sale in 2015 = 65200 – 64600 = 600

∴ The sale of the furniture in the year 2015 is 600

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