This table provides a summary comparison of the financial performance of three businesses.

Required:
a Calculate the value added by each business.
b Calculate the eco-efficiency ratios for water use for the three businesses.
c Which business has the most efficient water use?
d What other data would be useful to gain more insights into the overall eco-efficiency of each business?

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Sales Goods and services purchased Water use Business A $150 000 $ 30 000 96 megalitres Business B $390 000 $156 000 120 megalitres Business C $600 000 $420 000 144 megalitres