book Maths Puzzle Numerical Ability

Can someone help me with this problem?

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?
Thanks,
Lyn

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my questions is
solve the proportion
8/y = 4/7

thanks for the help Write the equation of each line. Give the answer in standard from using only integers as the coeffcients.

The line through (2,-3) that is perpendicular to the line y = -3x+12