Trying to help my daughter with this math since we cant see her tutor anymore if someone could please show me how to do these two problems so I can try to understand them I would be forever grateful!!

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.