77. In May, Rolf agrees to work for Soda Sales Company at $800 per week for a year beginning June 1. The following January, Tropic Beverages, Inc., offers Rolf the same work at $900 per week. Rolf tells Soda about the offer. Soda offers to enter into a new contract with Rolf at $875 per week. If Rolf agrees, is the new Soda contract enforceable? Why or why not