What is the % increase/decrease
from to ?
from to ?
Rounding
What is the percentage increase/decrease from 42 to 21?
Answer: The percentage change is -50%.
Let's see how we can calculate this percentage: what is the percentage increase/decrease from 42 to 21? Here is a very simple step-by-step guide to find out.
Step 1: We use the following formula:
\(\text{Percentage change}\) = \({Y-X \over X} \cdot 100\%\)
• \(X = 42\)
• \(Y = 21\)
• Percentage change calculation = \({21-42 \over 42}\) = \({-21 \over 42}\) = \(-0.5\)
• \(X = 42\)
• \(Y = 21\)
• Percentage change calculation = \({21-42 \over 42}\) = \({-21 \over 42}\) = \(-0.5\)
Step 2: A percentage is a number or ratio expressed as a fraction of 100.
\(-0.5\) = \(-50 \over 100 \) = \(-50\%\)
\(Answer: \) The percentage change is -50%.
\(Answer: \) The percentage change is -50%.
Use the percentage calculator to solve other similar percentage calculation questions.
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