exam Maths Puzzle Numerical Ability

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In the Complete Walker III (3rd ed., Knopf, New York, 1984, p. 505), Colin Fletcher's answer to "What games should I take on

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Margin of Profit is the net income divided by total sales.

A company's margin of profit increased by .02 from last year.
Last year the company sold its product at $3.00 each a find the magnitude of the following vector:
v=3i-2j