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Operating leverage: the same sales growth, very different profit growth

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The prompt

Two companies in Singapore each have revenue of SGD 1 million (1,000 thousand) and profit of SGD 100 thousand. All figures below are in SGD thousands. Company A has variable costs of 200 and fixed costs of 700. Company B has variable costs of 700 and fixed costs of 200. Sales rise 10 percent at both. What happens to profit?

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