Discussion
Three of the following describe an arithmetic gradient. The exception is
Answer: A
Correct answer: costs rising by 5 per cent each year
A constant percentage is a geometric gradient, each term a fixed multiple of the last. An arithmetic gradient rises by a constant amount, which is what the other three describe - 500 a year, a fixed annual increment, and the series rising by 200 each time. The distinction matters because the two use quite different factors.
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