to find this you would take each answer and multiple it by 6.45% so A=1.29 , B=1.6125,C=0.645,D=1.161 so the correct answer is B.
The phone which has a battery life that when 6.45% is used, corresponds to 1.6125 hours, is Phone B.
The battery life of each phone is given so in order to know which phone has a 6.45% battery life corresponding to 1.6125 hours, you simply need to multiply all the battery lives by 6.45%.
= Battery life of phone x 6.45%
Phone A:
= 20 x 6.45%
= 1.29 hours
Phone B:
= 25 x 6.45%
= 1.6125 hours
In conclusion, when 6.45% of Phone B's battery is used, it reduces its life by 1.6125 hours.
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