Why efficiency is written in percentage?

Why efficiency is written in percentage?

Efficiency is written in percentage unit. Efficiency is the ratio of the amount of useful work to  the total energy given. From the percentage value of efficiency, we can know how much of the input energy is ultimate of use. Like if an engine has an efficiency of 50%, which means it can convert 50% of the given energy to the usable work. That's why it is written in the percentage.

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