Delphox77id
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The mark-up for a 75 dollar golf club is 80 dollars. Find the percent of the mark-up.

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Apologiabiologyid
so from  75 to 80 and 75 is 100%

80-75=5
5 is x% of 75 
x%=percent markup
5=x% times 75
% means parts out of 100 so
x%=x/100
5=x/100 times 75
5=75x/100
75x/100=75/100 times x
75/100=3/4
5=3/4x
multiply both sides by 4/3
20/3=x
6.6666%
the percent mark up is 6.6666%

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