Arturo paid $8 in taxes on a purchase of $200. assuming the tac rate is the same, what would the tax be on a purchase of $150

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.