Problem

It costs dollar sign, 120 to have a party for 9 people at the skating rink. The cost includes a charge of dollar sign, 10 for each person attending the party plus the price of a cake.
How much does the cake cost?
dollar sign
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4