6. A battery-operated device needs to function for
28.2 hours. It functions for an average of 4.03 hours
on one battery. Write down a calculation you
could do mentally to estimate the number of
batteries required.
e
7. Store A sells a 500 GB hard disk for $85.05 with
a 20% discount while Store B sells the same hard
disk for $76.05 with a 10% discount. Write down
a calculation you could do mentally to help you
decide which store to buy the hard disk from.
Answers
Given : A battery-operated device needs to function for 28.2 hours. It functions for an average of 4.03 hours on one battery
To Find : estimate the number of batteries required.
Solution:
battery-operated device needs to function for 28.2 hours.
one battery functions for an average of 4.03 hours
n battery functions for n * 4.03 hours
n * 4.03 ≥ 28.2
=> n ≥ 6.998
7 batteries required
Store A
85.05 - (20/100)(85.05) = 68.04 $
Store B
76.05 - (10/100)(76.05) = 68.445 $
68.04 < 68.445
=> Store A is cheaper than Store B
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Step-by-step explanation:
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