3friends each create 4 bags of started bread dough after 10 days each of those four bags then divided into four more bags of the how many days passed before 192 of the are created

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.