Elli, who lost two cats, put an advertisement outside the local supermarket offering 500 dollars as reward to anyone who returned the cats. Xenia, who has read the advert, finds and returns one of the lost cats to Elli. Maria, who has not read the advert, finds and returns the other one.

REQUIRED:

Explain and distinguish between unilateral and bilateral contracts

Advise Elli as to his liability, if any, to Xenia and Maria