Assuming that 12 x 12 is 12" x 12" (one square foot), then 30 one-square-foot tiles would cover 30 square feet.
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190
start with 38 tiles.
It will require a minimum of 1,462 tiles. That number will cover about 1,850.34 square feet.
68
Each tile covers 4 square feet. Which means you need 200 tiles to cover 800 square feet, plus spoilage.