Aperson is working at a constant rate. if he produces 15 details in 8 hours, how long does he need to work to produce 18 details? write an equation!

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.