Pania agreed to write software codes for "a reasonable price" for a video game being produced by Mindbinder, Inc. When Pania submitted a bill for $5,000, Mindbinder believed that a reasonable amount for the work was $3,000 and sent Pania a check for that amount with a notation on the check, "Payment in full." 

Discuss what would be this case refer to and what will be the conclusion for that?