Answer:
Hello!
Judging by the question you provided I have come up with the correct solution:
Battery life decreased 50%
Step-by-step explanation:
To solve this problem I used a simple formula to figure out the rate at which the battery life decreased.
This foruma being:
[tex]\frac{7.5-hours}{15-hours}[/tex]=??
Which if you do the formula you should come up with:
[tex]\frac{7.5-hours}{15-hours}[/tex]=0.50, which if converted into a percentage would be:
50%
