Hugo decides to buy his Christmas gifts on Black Friday. To simplify his life, he is giving his 10 closest friends scarves for Christmas and everyone else Christmas cards. Hugo is willing to pay up to $20 each for 10 scarves. When he arrives at Macy's at 5:00 A.M. on Black Friday, he discovers that scarves are on sale for $12 each. Hugo buys 10 scarves and uses the remaining $80 to buy himself some clothes.

How much consumer surplus did Hugo receive from the tenth scarf he purchased?

Fill in the blank. Consumer surplus from the tenth scarf: $ _______________