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Answer:
14.4
Step-by-step explanation:
20% because:
rate of Increase = ( final - initial ) / initial * 100
rate of increase = ( 12 - 10 ) / 10 * 100
rate of Increase = 2 / 10 * 100
rate of Increase = 20
No because if it is the square root of 100, then it is rational, hope this helps