To calculate the percent of decrease from 80 to 12, you can follow these steps:
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Find the difference between the initial value and the final value: \[ \text{Difference} = \text{Initial Value} - \text{Final Value} = 80 - 12 = 68 \]
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Calculate the percent decrease by dividing the difference by the initial value and then multiplying by 100: \[ \text{Percent Decrease} = \left(\frac{\text{Difference}}{\text{Initial Value}}\right) \times 100 = \left(\frac{68}{80}\right) \times 100 \]
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Perform the division: \[ \frac{68}{80} = 0.85 \]
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Multiply by 100 to get the percentage: \[ 0.85 \times 100 = 85% \]
Thus, the percent of decrease from 80 to 12 is 85%.