if in the school there are 100 students prefer Hip Hop then we have to calculate the 100% with a rule of three so:
[tex]\begin{gathered} x\to100 \\ 100\to40 \end{gathered}[/tex]so the equation is:
[tex]\begin{gathered} x=\frac{100\cdot100}{40} \\ x=250 \end{gathered}[/tex]So in total there are 250 students