Respuesta :

Answer:

  8%

Step-by-step explanation:

The amount repaid is ...

  A = P(1 +rt)

Filling in the given values, we can find r.

  (18·28) = 450(1 +r(18/12)) . . . . . t is in years

  504 = 450 + 675t

  54/675 = 0.08 = 8%

The simple interest rate on the loan is 8%.