Question

a battery was charged. when the charging began, it was 23 percent full. after 30 minutes of charging, the battery was 89 percent full. how fast was the battery charged? percent per minute how long did it take the battery to be fully charged? minutes show calculator

Explanation:

Step1: Calculate total percent charged

$89\% - 23\% = 66\%$

Step2: Find charging rate per minute

$\frac{66\%}{30\ \text{minutes}} = 2.2\%$ per minute

Step3: Calculate remaining percent to full

$100\% - 23\% = 77\%$

Step4: Find total time to full charge

$\frac{77\%}{2.2\%\text{ per minute}} = 35\ \text{minutes}$

Answer:

2.2 percent per minute
35 minutes