Teacher:  Agr Tum Dost Ko 500 Rs. Do,
Usko 200 Ki Zarurt Ho To,
Wo Kitne Wapas Dega ??
.
Studnt:" Kuchh Bhi Nai..
.
Teacher:" Kya Tum Maths Nai Jante ??
.
Student: Sir Aap Un Kamino Ko Nahi Jante.
Hahahahahaha :D