The teacher asked little Johnny; “Johnny, if your father borrowed $200 and promised to pay it back at $10 each week, how much would he owe at the end of the week?”
Little Johnny had a think about it and replied, “$200”.
The teacher, getting frustrated, said; “You don’t know your arithmetic very well, do you Johnny?”
With a grin on his face, little Johnny replied, “Maybe not, but I do know my Dad.”