Calculate the number of 12"×12" VCT tiles needed for a room measuring 20' × 24', including 5% waste.
Correct Answer
A) 504 tiles
Room area: 20' × 24' = 480 sq ft. Each 12"×12" tile = 1 sq ft. With 5% waste: 480 × 1.05 = 504 tiles needed.
Why This Is the Correct Answer
The calculation correctly determines the room area as 480 square feet (20' × 24'). Since each 12"×12" tile covers exactly 1 square foot, 480 tiles would be needed for perfect coverage. Adding the 5% waste factor (480 × 1.05) gives 504 tiles, which accounts for cutting waste, breakage, and future repairs.
Why the Other Options Are Wrong
Option B: 528 tiles
This answer (562 tiles) represents approximately 17% waste factor, which is extremely excessive and would indicate poor planning or calculation errors.
Option C: 545 tiles
This answer (528 tiles) represents a 10% waste factor calculation (480 × 1.10 = 528), which is excessive for VCT tile installation where 5% waste is standard.
Memory Technique
Remember '12×12=1' - twelve inch tiles always equal one square foot, so room square footage plus waste percentage equals total tiles needed
Reference Hint
Florida Building Code Chapter 4 - Interior Finishes, or construction estimating references covering flooring material calculations
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