Change to a Percentage

any help appreciated 

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On paper 1 the score is 75% of 60=75×60/100=¾×60=45.

On paper 2 the score is 55% of 140=55×140/100=11×140/20=77.

Total 45+77=122 out of a possible 60+140=200 is 122/200×100=61%.

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