Need to have issue, law, application and conclusion.

QUESTION 1 (a) 03) Leslie went to Pick N Go Supermarket to buy some groceries. He saw a poster in the supermarket that read \"Buy 3 packs of Oceania tissue paper and get 1 pack free". Leslie took 4 packs of Oceania tissue paper and wentto the payment counter. The cashier informed him that the promotion had already ended and that he would have to pay for all 4 packets of the Oceania tissue paper. Leslie then decided to not buy the tissue papers, but the cashier insisted that he has to pay for all the 4 packs of the Oceania tissue paper. Advise Leslie. (12 marks) On her way home from work, Dahlia's car had a at tire. A bystander, Jay assisted Dahlia to change the tire. Grateful for Jay's help, Dahlia promised to pay RM100 to Jay. It has been a month and Dahlia has still not paid the money to Jay. Can Jay sue Dahlia for the money? (8 marks)