Tina appoints Brad as checkout operator at her independent garage. She operates as a sole trader – her business is not incorporated. The business operates both as a service station and as a used-car lot.
Tina contracts glandular fever, and during the four months she is off work, she tells Brad that he can order petrol while she is sick. During this period, Brad negotiates supplies with Caltex. Brad orders fuel from Caltex every fortnight. Tina returns from her illness, and tells Brad that he should no longer order petrol and that matters will be conducted as they were before she was ill. However Brad, who enjoys the increased status of dealing with the oil companies, ignores Tina’s instruction, phones Caltex and orders 30 000 litres of fuel. When the truck arrives to deliver the fuel, Tina is furious (as she has already entered into a more advantageous arrangement with BP). She phones Caltex, and denies that there is a contract between her and Caltex, stating that Brad was acting contrary to instructions when he placed the order.
Tina employs Paul as a salesman of the used vehicles. Paul has several years experience in the second hand vehicle market. Tina has a number of vehicles on display, including a 2012 Holden Commodore Wagon, priced at $ 19 000. She does not realise that the vehicle could easily fetch $ 25 000. Paul however does know this, and also that his next door neighbour, Fred, wants to purchase just such a vehicle. Paul says that he needs a vehicle himself, and buys the wagon from Tina for $ 19 000. He then sells it to Fred for $ 25 000. Tina is furious when she finds out what has happened.
Advise Tina as to her legal position in relation to the above situations, citing relevant authority.