Andy estimated that he would need 78 ft of a lumber for a tree house project. He later found that the actual amount of lumber needed was 67 ft. What was the percent error of Andy's estimation

A16.42%
B11℅
C14.10℅
D85.90℅

if we take 78 as the 100%, what's 11 of it?
well \(\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 78&100\\ 11&x \end{array}\implies \cfrac{78}{11}=\cfrac{100}{x}\)

solve for "x"

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Andy estimated that he would need 78 ft of a lumber for a tree house project. He later found that the actual amount of lumber needed was 67 ft. What was the percent error of Andy's estimation A16.42% B11℅C14.10℅D85.90℅

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Andy estimated that he would need 78 ft of a lumber for a tree house project. He later found that the actual amount of lumber needed was 67 ft. What was the percent error of Andy's estimation

A16.42%
B11℅
C14.10℅
D85.90℅