Practice quiz #57 wrong calculation

Programming and Analysis practice exam thread #57 is incorrect. When calculating the SF of the park it states that the 300’ x 300’ park is only 81,000 sf when it should be 90,000 sf. Changing the final answer from 20.8 acres to 21.1 acres. The answer is still B since we are to round but the math shown is not correct. See Below A developer wishes to place the following on a site:

  • 12 clusters of attached single family housing units (typical site dimensions for each cluster is 300 feet by 125 feet)

  • Public school building (site dimensions including parking is 300 feet by 150 feet)

  • Shopping center (site dimensions including parking is 300 feet by 600 feet)

  • Park (site dimensions are 300 feet by 300 feet, no parking needed)

The site should allow approximately 20% more area for roads.

Assuming the entire site is available for development, what size site is most suitable for the development?

A. 10 acres
B. 20 acres
C. 30 acres
D. 40 acres

Answer: (Click blurred text to reveal)

The answer is B. 20 acres

Find the total area required by adding up the areas of the parts.

12 housing clusters:
12 x 300 feet x 125 feet = 450,000 square feet

Public school building:
300 feet x 150 feet = 45,000 square feet

Shopping center:
300 feet x 600 feet = 180,000 square feet

Park:
300 feet x 300 feet = 81,000 square feet
←- This should be 90,000 square feet

Total: 756,000 square feet

Add 20% for roads:
756,000,000 square feet x 1.2 = 907,200 square feet

Divide by 43,560 to get acres.
907,200 / 43,560 square feet = 20.8 acres

The closest answer is B, 20 acres.