Question

A battery was charged. When the changing began, it was 23 percent full. After 30 minutes of charging, the battery was 89 percent full. How fast was the battery charged?

Answer 1

Before it charged, the battery was at 23%. In half and hour, it went to 89%. So, it rose 89-23, or 66% in half an hour. Now that we know how much it rose and that there are 30 mins in half an hour, we have to divide 66% by 30 to figure out the answer.

66/30 is 2.2. 

So, the battery rose at 2.2% per minute. 

Hope this helps!