Banksia invites tenders for builders to complete the project. The tendering process takes one month. The successful builder, Al Contractors, is unable to start work on Banksia's project for a further three months because of other building works that they are involved with Banksia nevertheless engaged Al. As a result of the building not being completed by the original date, Banksia lost a major tenant who was going to lease an entire floor of the building at a rate of $20 per square metre above the market rate. Advise Banksia and Mario of their legal rights. [10 marks]