The following facts have occurred .   Hillary advertised a printing press in a specialist journal for £15.000 . Eleanor wrote to Hillary to buy it for £10.000 . Hillary replied by return of post saying she would accept £13.000 . When she heard nothing further from Eleanor, Hillary wrote again saying she would accept £10.000 . Eleanor says she no longer wants to buy the printing press .  Hillary wrote to Amy offering for sale an office computer for £1.000 . The morning that she received the letter Amy wrote to Hillary agreeing to buy at the asking price . After she had posted the letter , but before it was delivered , Amy changed her mind and sent Hillary a fax asking her to ignore the letter when it arrived . Hillary decided to have a grand summer sale at her art gallery . She put large notices in the windows of the gallery stating that a valuable painting by Trumpeter, a famous artist, would be available for £1 to the first customer who came into the gallery at the commencement of the sale, together with a free signed print of another Trumpeter painting, Olivia waited outside the shop for two days before the sale started to be sure of getting the painting, but as she entered the shop, Hillary told her that the painting by Trumpeter was no longer for sale .