DDy operaits a taxi company and lids entered Into lucrative contacts mull vo law firms, City Slackers LLP and Fat Cats LLP. The following events CCUN: Her contract with City Slackers involves the supply of ten taxis every night to take their employees and clients home from the firm's offices. After a month, Abby realises that the rise in petrol prices has made it impossible for her to supply the taxis without operating at a loss. She contacts City Slackers and informs them that she will not be able to supply the full quota of ten taxis the following night. City Slackers are hoping to finalise a very profitable deal with important clients that week and have no time to find an alternative taxi firm. In addition, they think that Abby's professional taxi service will give a good impression and may help to seal the deal. They therefore agree to pay Abby an extra $500 if she can continue to provide the taxis for the rest of the week. Abby agrees but when she invoices City Slackers they refuse to pay her the additional money