The only init of measurement given in the question refers to feet so the answer uses feet as the relevant unit.
A 24 ft x 24 ft tile covers 576 square feet so 4 such tiles will be enough.
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43.58899 is. (rounded)
You can just square the amount of numbers your want to get your answer. 1900^2 = 3,610,000
area = 50 ft × 38 ft = 1900 sq ft
1900
1900 - (30% x 1900)= 1900 - (0.30 x 1900) = 1330