[tex]\large\mathcal{Answer:}[/tex]
A. Base
[tex]\large\mathcal{Explanation:}[/tex]
The percentage is associated with the word "is". The rate is associated with the percent sign (%). And the base is associated with the word "of". In this case, 120 is associated with the word "is" so, 120 is the percentage. Next, we know that 50 is associated with the percent sign so, 50 is the rate. Last, the word "what" is associated with the word "of" so, the missing is the base.
120 = Percentage
50% = Rate
Missing: Base
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