The volume of a right-circular cylinder is V = r2h, where r is its radius and his its height. Let's assume all the length units are in microns (μm). Furthermore, it turns out that this cylinder is describing a special kind of cancerous tumour, which is growing. The radius r is growing at a rate of 7 μ m/second while the height h is growing at a rate of 6 μm/second. Find the rate of increase in volume (in μm³/second) when r=15 μm and h=7 μm. [Answer should be correct upto second decimal place]

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