Final answer:
To find the percent increase from 1.5 to 2.5, calculate the difference (1.0), divide by the original value (1.5), and multiply by 100% to get a 66.67% increase.
Step-by-step explanation:
To calculate the percent increase from 1.5 to 2.5, you need to determine the change in quantity and then relate that change to the original amount. The formula to find the percentage change is
(Change in Quantity) / (Original Quantity) x 100%.
First, calculate the difference between the new value and the original value: 2.5 - 1.5 = 1.
Next, divide this change by the original value: 1 / 1.5 = 0.6667.
Finally, to find the percentage increase, multiply by 100%: 0.6667 x 100% = 66.67%.
So, the percentage increase from 1.5 to 2.5 is 66.67%.