Fiona is going to put some shelves up in her living room. The shelves must each be 1.80 m long and have a depth of at least 40cm. There will be five shelves in total. The different prices for wood are shown in the table below. [image of table] Fiona can cut pieces of wood to make more than one piece of the correct size, but she wants each of the shelves to be made of one complete piece of wood.