Real Estate Math

A North Dakota home is on a 9,600 sq ft lot. A local ordinance requires 30% of the lot to remain as open space. How many square feet may be built upon?

A2,880 sq ft
B4,800 sq ft
C6,720 sq ft✓ Correct
D7,200 sq ft

Explanation

Required open space = 9,600 × 30% = 2,880 sq ft. Buildable area = 9,600 − 2,880 = 6,720 sq ft. Remember: 1 acre = 43,560 square feet. Multiply or divide as needed to convert between units.. The correct answer is 6,720 sq ft.. This is a common calculation on the North Dakota real estate exam.

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