Divide both numbers by their greatest common factor, 3.
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It is 39/60 which can be simplified, if required.
4 minutes (or minuites) is 4/60 of an hour. You can simplify that ratio if required.
156/240 = 78/120 = 39/60 = 13/20
Because percent is always associated with being a part of 100, you would simply place 60 over 100 and simplify. 60/100=6/10=3/5. So 3/5 = 60%.
60-39=21.