100 free points have a great day ^w^

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?