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The answer is 20000 - 4632 = 15468
It is: 18,000
sqrt(2000) = 44.7sqrt(20000) = 141.4So the perfect squares between 2000 and 20000 are the squares of 45 to 141 (inclusive)ie there are 97 perfect squares in the interval.
It is: 15,000
30% of 15000 = 30% * 15000 = 0.3 * 15000 = 4500