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Ealing and Northfield

Rises multiply, they don’t add up

Tim Simpson writing in the Ealing & Acton Gazette today showed his lack of mathematics. He pointed out that the last five rises in council tax added up to 49.7%. His calculation was 4.7% + 4.9% + 6.8% + 25.9% + 7.4% = 49.7%. With a bit more attention in maths classes he would have known that percentages need to be multiplied, not added. The correct calculation would have been 1 * 1.047 * 1.049 * 1.068 * 1.259 * 1.074 = 1.586 or 58.6%.

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