Tania compro una camiseta de 15000 colones y un bolso de 14000 colones pero le hicieron un descuento y en total solo pago 26000 colones cuanto descuento le hicieron? Ayuda amigos

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.