August hosted two dinner parties for his friends. Twenty guests attended the first party, and thirty-two guests attended the second party. What is the percentage increase of the number of guests from the first party to the second party?
A.) 40%
B.) 70%
C.) 30%
D.) 60%

so from 20 to 32, is cleary just 12 units.

if we take 20 to be the 100%, what is 12 off of it in percentage?

[tex]\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 20&100\\ 12&p \end{array}\implies \cfrac{20}{12}=\cfrac{100}{p}\implies p=\cfrac{12\cdot 100}{20}[/tex]

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August hosted two dinner parties for his friends. Twenty guests attended the first party, and thirty-two guests attended the second party. What is the percentage increase of the number of guests from the first party to the second party? A.) 40% B.) 70% C.) 30% D.) 60%

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August hosted two dinner parties for his friends. Twenty guests attended the first party, and thirty-two guests attended the second party. What is the percentage increase of the number of guests from the first party to the second party?
A.) 40%
B.) 70%
C.) 30%
D.) 60%