Question

11. A battery was tested and found to power a cassette player for 12 hours. An improved version of the battery powered the cassette player for an extra 30 minutes. Find the percentage increase in the life of the batteries.

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Answer 1

Step-by-step explanation:

4.2% is the answer

Hope its help..

Answer 2

Answer:

The correct answer is 4.2%

Step-by-step explanation:

12 hours can be converted in 720 minutes

So we consider 720 minutes as 100 %

So 720 = 100x

So x = 7.2

Now the improved version has extra 30 minutes so , 30/7.2 = 4.17 approx 4.2 %

So percentage increase is 4.2 %