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Verified Answer :

mfuadchow

All you have to do is divide the medium sized jerseys by the total number of jerseys and multiply by 100. 

15/50*100=30%

I would make a proportion for this so (15/50)=(x/100), the x will give you the percentage. Cross multiply to get 50x=1500, then divide both sides by 50, so 30% is your answer because 1500/50=30 so x=30