Relative Improvement

A Boy was playing in the park with his father sitting on a bench with his friend.

Father: Beta ! What is 9 multiplied by 8 ?

Beta: 76

Father : Good!

Father's friend got terrified.

Friend: Arre Yaar! 9 multiplied by 8 is 72. your boy said 76 and you congratulated him.

Father: He has improved a lot. He used to say 80.