What are the advantages of using percentages to represent ratio

The advantages of using percentages are that they all are to the same scale (1/100) making it easier to work with compared to fractions, they can be converted to decimals very quickly, and percentages can be used to show change in a number (20% of 50 : 50% of 10), telling you what the original number is. (10:5 or 2:1 doesn’t give you the starting numbers).

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The answer is 6 weeks