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The normal convention when rounding numbers if to "round up" if the last decimal place is 5 or more or "round down if it is 4 or less eg. 5.55 would become 5.6 and 5.54 would become 5.5

3.999 includes 3 decimal places (the numbers after the "."), each of which would round up - so when rounded up to one decimal place it would become 4.0

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Sampson Dunyo

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42.492
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Profit

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4

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4.0

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4.0

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