Question 150274
You can simply put 84 over 120 and divide:

84/120=.7000


Now move the decimal over twice to the right to get the percent:
70.00%
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Or you can cross multiply with two fractions:

84/120=x/100


The x is over 100 because you want the percent, not the decimal.  This proportion is literally saying, "84 is to 120 as x is to 100".  You can also do:


120/84=100/x   which is literally saying, "120 is to 84 as 100 is to x".  As long as you are consistent, it doesn't matter.


Once you have:
84/120=x/100,


cross multiply.
84(100)=120(x)


Simplify
8400=120x


Divide both sides by 120
70=x


so 70%.
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It doesn't matter which way you do it, so whichever is easier for you to do, by all means, do it that way.  I hope I've helped you!