Question

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.

Answer 1

The answer to your question is 4.2%

Explanation:

12 hours can be converted in 720 minutes

Consider 720 minutes as 100 %

720 = 100x

x = 7.2

" Improved version " has extra 30 minutes so , 30/7.2 = 4.17 approx 4.2 %.

Thus, the answer is:

4.2%