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What is the percent of change from $50$ to $90$ ? $\newline$ Choices: $\newline$ (A) $40\%$ decrease $\newline$ (B) $80\%$ increase $\newline$ (C) $40\%$ increase $\newline$ (D) $80\%$ decrease

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Percent of change

Full solution

Q. What is the percent of change from

50

to

90

?

\newline

Choices:

\newline

(A)

40\%

decrease

\newline

(B)

80\%

increase

\newline

(C)

40\%

increase

\newline

(D)

80\%

decrease

Calculate Difference: Step $1$ : Calculate the difference between the final and initial values. $\newline$ Initial value: $50$ $\newline$ Final value: $90$ $\newline$ Difference = Final value - Initial value = $90 - 50 = 40$
Calculate Percent Change: Step $2$ : Calculate the percent of change. $\newline$ Percent of change = $(\frac{\text{Difference}}{\text{Initial value}}) \times 100\%$ $\newline$ Percent of change = $(\frac{40}{50}) \times 100\%$ = $0$ . $8$ \times $100$ \% = $80$ \%
Determine Increase or Decrease: Step $3$ : Determine if it's an increase or decrease. $\newline$ Since the value increased from $50$ to $90$ , it's an increase.

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