Q1. Global copper resources are estimated at just over 5,000 million tonnes with 830 million tonnes currently available in existing reserves. In 2019, annual copper demand was 28 million tonnes and approximately 35% of this demand was met with recycled rather than mined copper. (a) If global copper demand remains constant, how long will existing reserves and global resource last? [10 marks] (b) In reality, global copper demand is growing at a constant rate of 2.5% per year. If recycling rate remains constant, how long will existing reserves and global resources last? State your assumptions clearly. [30 marks] (c) Without calculation, explain how you would approach reformulating and solving the equation in (b) if the rate of recycling increases at a constant rate each year. What would you expect to happen existing reserves and global resources? [10 marks]