Joanna earns $18 per hour, plus a 4% commission on each appliance she sells. If she works 8 hours and sells an appliance for 900$ how much does she earn in total?

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.