A retailer is offering 5% off your total order, if you sign up for their email list. If your total is $254.20, how much will you save by signing up?

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.