Discussion
What is the average (arithmetic mean) per unit revenue generated during 2011 to 2015 :
Answer: B
The key's answer is Rs. 200, the average revenue per unit over the whole period.
Taking the five years together, divide total revenue by total quantity exported:
\[ \begin{aligned} \text{revenue} &= 20+15+35+40+50 = 160\ \text{crore} \\ \text{quantity} &= 10+5+15+20+30 = 80\ \text{lakh} \\ \text{per unit} &= \tfrac{160}{80} \times 100 = \text{Rs. } 200 \end{aligned} \]
Averaging the five yearly figures instead (200, 300, 233, 200 and 167) would give about Rs. 220, which is not among the options, so the key uses the overall ratio. Rs. 166, Rs. 233 and Rs. 300 are the single-year figures for 2015, 2013 and 2012.
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