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