1. A arranges for B to clean A's windows and promises to pay B $30 for this work.B does the work. How does the analysis of 'benefit' and 'detriment' apply in identifying the consideration supplied by B for A's promises of payment?

1. As in (1), but this time A pays the $30 immediately and B promises to clean the windows next Tuesday. What is the consideration for B's promise?

1. As in (1), but A and B arrange for the windows to be cleaned next Tuesday, with A paying $30 on completion of work. Suppose B does not turn up on Tuesday. Is B in breach of contract?

Now try these:

1. A promised her son B that if he refrained from smoking and drinking until he was 21, A would buy him a car. B has just turned 21 but A refuses to buy the car, saying that B's abstinence has been good for his health. Advise B.

1. B gave A a tow to the nearest garage. A promised B a lottery ticket. No ticket has eventuated. Advise B. What effect would it have if A had flagged down and said to her, "If you give me a tow I'll make it worth your while"?

1. In 1986, A entered into a 10-year lease of premises that she intended to use as an outdoor restaurant. She did so use the premises until mid 1987 when a large area directly across the road was redesignated a refuse tip and her clientele dropped off. Unable to get out of the lease, A approached her landlord, B who agreed to halve the rent. In the Christmas of 1989 the tip closed and converted into a park. A's business is booming. B had demanded back rent at the full rate; first, as from Christmas of 1989, and secondly, from mid-1987. Advise A.