Question

Members of the student council are selling T-shirts. The number of T-shirts sold and the amount of money collected each day is shown in this table.

T-shirt Sales
Day
T-Shirts Sold
Amount Collected
Monday
12
$180
Tuesday
15
$225
Wednesday
21
$315
Thursday
17
$255
Friday


$570


Part A: Determine the unit rate for the amount of one T-shirt. Explain how you determined the unit rate.

Answer 1

9514 1404 393

Answer:

$15

Explanation:

The desired rate is ...

"unit rate" = cost/T-shirt = $180/(12 T-shirts) = $15/T-shirt

__

The unit rate is based on its definition. Here, the rate of interest is the cost per shirt, so it is found by dividing the cost by the number of shirts.