There are 50 multiples of 80 between 1 and 4000, as 4000 divided by 80 equals 50. However, the question asks for the number of occurrences of the digit "8" in the range from 1 to 4000, not the number of multiples of 80. The digit "8" appears in the units place for numbers 8, 18, 28, ..., 3998, occurring 500 times. Additionally, it appears in the tens place for numbers 80, 81, ..., 89, 180, 181, ..., 189, and so on, occurring 400 times. Therefore, the digit "8" appears 900 times in the range from 1 to 4000.
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4000 ÷ 100 = 40
There are 200 groups of 20 in 4000.i.e. 4000 / 20 = 200200 x 20 = 4000
4000/16 = 250
Answer: 4000 ft² = 371.612 m²
Forty of them