With this kind of problem you can just put it in your calculator like this

and do that for every single one. And the way to turn a percent into a decimal is to move it over two places to the left. so 10% becomes .1 and 43% becomes .43 and so on.
The answer is:
Least is C which equals 59.5
The middle is A which equals 70
The most is B which equals 87.5
Hope I helped!