His friend Thomas grants him a loan of $ 5000, instructing him to charge 10% periodic interest for forty (40) months using the simple interest method. Calculate the interest and the total pay? a) $ 1,800, interest, total payable $ 6800 b) $ 1,667 interest, total payable $ 3,333 c) $ 1,500 interest, total to pay $ 6,500 d) $ 1,667 interest, total payable $ 6,667 e) _______________________________