"200 Bucks" joke

A guy goes over to his friends house, rings the bell, the wife answers.
'Hi is Tony home?'
'No he went to the store.'
'Well, you mind if I wait?'
'No come in.'
They sit down and the friend says 'You know Nora, you have the greatest breasts I have ever seen. I'd give you a hundred bucks if I could just see one.'
Nora thinks about this for a second an figures what the hell - a hundred bucks.
She opens her robe and shows one. He promptly thanks her and throws a 100 bucks on the table.
They sit there a while longer and Chris says 'They are so beautiful I got to see the both of them. I'll give you another 100 bucks if I could
just see the both of them together.'
Nora thinks about this and says what the hell, opens her robe and gives Chris a nice long look.
Chris thanks her and throws another 100 bucks on the table then says he can't wait any longer for Tony and leaves.
A while later Tony arrives home
and his wife says 'You know your weird friend Chris came over.'
Tony thinks about this for a second and says 'Well did he drop off the 200 bucks he owes me?'