If the quantity of concrete were increased to 3 cubic yards, what would be the total price including tax, using the same tax rate?

If the quantity of concrete were increased to 3 cubic yards, what would be the total price including tax, using the same tax rate?

• A. $270.00
• B. $293.63
• C. $315.00
• D. $300.00

Answer: (B)

The main idea is that when a price already includes tax, the cost scales linearly with quantity. Keep the price per cubic yard including tax the same, and multiply by the new quantity to get the new total. To find that unit price, take the original total (which already includes tax) and divide by the original quantity. Then multiply by three for three cubic yards. Following this method yields a total of 293.63, which matches the option shown. The other numbers would require either adding tax separately or using a different per-yard price, which isn’t the case here.

The main idea is that when a price already includes tax, the cost scales linearly with quantity. Keep the price per cubic yard including tax the same, and multiply by the new quantity to get the new total. To find that unit price, take the original total (which already includes tax) and divide by the original quantity. Then multiply by three for three cubic yards.

Following this method yields a total of 293.63, which matches the option shown. The other numbers would require either adding tax separately or using a different per-yard price, which isn’t the case here.