Question

Cassie buys a box of 36 batteries for $15. Express the rate in its simplest form.

a) $0.42 per battery

b) $0.38 per battery

c) $0.45 per battery

d) $0.40 per battery

Answer 1

Cassie buys batteries at a rate of $0.42 per battery, determined by dividing the total cost by the number of batteries and rounding to the nearest cent.

Step-by-step explanation:

To find the rate at which Cassie buys batteries, we need to divide the total cost by the number of batteries. So we take the $15 she spent on batteries and divide by the 36 batteries she received
$15 ÷ 36 = $0.4166…

We then round this to the nearest cent to find the rate per battery. When we do this, it rounds to $0.42, since the digit after the hundredth place (6) is 5 or more, which means we round up. Thus, the rate of the batteries in its simplest form is $0.42 per battery.