Annual sales average of all products is the least in which year?
Explanation:
Because the cost per product is assumed to be the same for each product for each year, the average sales (or total sales) for any year across products can be found on the basis of units sold itself.
i.e., the year with highest units sold will also have highest average annuals sales.
2010: 500 + 600 + c + 1200 + 1600
= 3900 + c = 3900 + 800 = 4700
2011: 800 + 600 + 1400 + 1100 + 300 = 4200 2012: 1200 + 1000 + 1500 + d + 200
= 3900 + d = 3900 + 600 = 4500
2013: a + 1000 + 800 + 100 + 2000 = a + 3900 = 4400 Thus, the minimum sales are in 2011.
Hence, option (b).
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