Mr. Cheng gave away 720/12 = <<720/12=60>>60 umbrellas.
So he sold 720 - 60 = <<720-60=660>>660 umbrellas.
Thus, he was able to collect $6 x 660 = $<<6*660=3960>>3960 from selling the umbrellas. Answer: \boxed{3960}.
Mr cheng had 720 umbrellas. Hr gave 1 12 of them to his friends and sold the rest at $6 each. How much money did he collect?
1 answer