book Maths Puzzle Numerical Ability

Please help me on this question. In 1990, the population of Alabama was 4,040,587. In 2000, the population was 4,447,100. Find the percent of change from 1990 to 2000. i know the answer is 10.1% I just dont know how to work it. please help. thank you.

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book Other Question

2y squared + 2=9y is there a trick to finding a prime number