If 10 ounces of granules are collected on a 150 square foot tarp during a trial run, how many pounds per acre are being applied?

• A. 100 lbs/ac
• B. 181.5 lbs/ac
• C. 200 lbs/ac
• D. 150 lbs/ac

Answer: (B)

Think of the test as a rate that starts with how much material you collected on a known area and then scales up to a full acre. Convert the collected amount to pounds: 10 ounces is 0.625 pounds. This 0.625 pounds were spread over 150 square feet, so the rate is 0.625 lb ÷ 150 ft^2 = 0.004167 lb per ft^2. An acre is 43,560 square feet, so multiply: 0.004167 × 43,560 ≈ 181.5 pounds per acre. So the trial indicates about 181.5 lbs per acre. If you skip converting ounces to pounds or skip the square-foot-to-acre conversion, you’ll get a different number.