Well, for number one, the answer is 3 because if you were to convert 25% into a fraction it would be 25/100 and when you reduce that it's 1/4 so you divide 12 by 4 to get your answer.
For question number 3, the new total is 199. Because 99% of 100 is 99 and so you basically add 100 and 99 together to get the answer.