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The correct answer is 150 school-supply kits.
To solve this problem using a unit rate, we divide the total number of school-supply kits (40) by the time it took to put them together (8 minutes).
40 kits / 8 minutes = 5 kits per minute
Then, we multiply the unit rate (5 kits per minute) by the desired time (30 minutes).
5 kits/minute * 30 minutes = 150 school-supply kits
So, volunteers could put together 150 school-supply kits in 30 minutes.