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The average sales of a bike showroom from 2014 to 2017 is Rs. 106000, and that of the years 2015 to 2018 is Rs. 138000. If the sales in 2018 is Rs. 149000, then the sales in 2014 was?
1. Rs 32,000
2. Rs 39,000
3. Rs 52,000
4. Rs 21,000
5. Rs. 36,000

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Correct Answer - Option 4 : Rs 21,000

Given:

Average sales from 2014 to 2017 = Rs. 106000

Average sales from 2015 to 2018 = Rs. 138000

Sales in 2018 = Rs. 149000

Formula used:

Average = sum of observations/total number of observations

Calculation:

Total sales in 2014, 15, 16, 17 = 4 × 106000 = Rs. 424000

Total sales in 2015, 16, 17, 18 = 4 × 138000 = Rs. 552000

Total sales in 2015, 16, 17 = 552000 - 149000 = Rs. 403000

Sales in 2014 = 424000 - 403000 = Rs. 21000

∴ The sales were Rs 21000

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