Please help me ;-; please

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

If 25% of y is 30, what is 60% of y?

What is the inverse of f(x) = 6x -24