Mr. Thompson is buying rulers for his class.

Which option gives Mr. Thompson the best price per ruler?

A. 4 rulers for $1.00
B. 50 rulers for $15.00
C. 100 rulers for $20.00
D. 200 rulers for $30.00

To find the price per ruler for each option, divide the total cost by the number of rulers.

For option A, 4 rulers for $1.00, the price per ruler is 1.00 / 4 = $0.25 per ruler.

For option B, 50 rulers for $15.00, the price per ruler is 15.00 / 50 = $0.30 per ruler.

For option C, 100 rulers for $20.00, the price per ruler is 20.00 / 100 = $0.20 per ruler.

For option D, 200 rulers for $30.00, the price per ruler is 30.00 / 200 = $0.15 per ruler.

Therefore, option D gives Mr. Thompson the best price per ruler.

To determine the best price per ruler, we need to calculate the price per ruler for each option.

Option A: 4 rulers for $1.00
Price per ruler = $1.00 / 4 rulers = $0.25 per ruler

Option B: 50 rulers for $15.00
Price per ruler = $15.00 / 50 rulers = $0.30 per ruler

Option C: 100 rulers for $20.00
Price per ruler = $20.00 / 100 rulers = $0.20 per ruler

Option D: 200 rulers for $30.00
Price per ruler = $30.00 / 200 rulers = $0.15 per ruler

Comparing the prices per ruler, we find that option D, 200 rulers for $30.00, gives Mr. Thompson the best price per ruler at $0.15 per ruler.

To find the best price per ruler, we need to calculate the price for each ruler in each given option.

Option A: 4 rulers for $1.00
Price per ruler = $1.00 ÷ 4 rulers = $0.25 per ruler

Option B: 50 rulers for $15.00
Price per ruler = $15.00 ÷ 50 rulers = $0.30 per ruler

Option C: 100 rulers for $20.00
Price per ruler = $20.00 ÷ 100 rulers = $0.20 per ruler

Option D: 200 rulers for $30.00
Price per ruler = $30.00 ÷ 200 rulers = $0.15 per ruler

Based on the calculations, option C offers the best price per ruler as it costs only $0.20 per ruler.