exam Maths Puzzle Numerical Ability

I cant figure this out

the number of students at westwood high school with a drivers license is 558. this is 24% more than last year. how many students had a drivers license last year.

THANKS

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exam Other Question

For the general cubic polynomial f(x)= ax^3 + bx^2 + cx + d (a different from 0).
Find conditions on a, b, c, and d to ensure that f is always increasing or always decreasing on (-00, +00). The demand and supply equations for a certain item are given by

D = -5p + 40
S = -p^2 + 30p - 8

Find the equilibrium price.