Wendy Daze, a19 year oldcollege sophomore, wants to purchase a car from Reliable Motors.She tells the sales representative that her payments cannot exceed $400.00 per month.After looking at several models of cars, she selects a2014Sportswagonproviding her payments will be under $400.00.The sales rep tells Wendy that the car sells for $16,500, but there is a $1,000 holiday bonus rebate and she will get credit for trading in her old 2008model Ford. However, there will be taxes and processing fees added to the total.Wendy agrees as long as her payments are under $400.The sales rep takes the paperwork to the financial manager to draw up the contract.When the sales rep comes back, he tells Wendy that the final cost of the car is $14,000 and her payments will be $390.00 per month.Wendy signs the contract and drives away in the car.Two months later, Wendy receives a letter from the finance office of Reliable Motors stating that when they calculated her costs, they made an error and the actual cost of the car is $15,100, and she would have to send them a certified check for $1,100 or they would take legal action against her. b. What type of mistake happened on this contract?