A school had 900 students at the start of a school year. If there is an enrollment increase of 7% by the beginning of the next year, what is the new enrollment?
1% of 900 is 9 (move the decimal place two places to the left). 7% is 7 times as much as 1%, which means it is 9*7 = 63 new students. Add this to your original 900, and the total new enrollment is 963.