You run a restaurant and are considering adding Indian cuisine to the regular burger menu. The restaurant generated pre$-$tax operating income of $60,000$ in the most recent year. By investing $50,000$ in new commercial ovens and grills $($depreciable straight line over $5$ years to a salvage value of zero$)$ today, you believe that you can increase your operating income significantly each year. How much would your pre$-$tax operating income have to increase each year for the next $5$ years $($the remaining period on your lease$),$ for the investment to make economic sense, if your cost of capital is $15\%?($The main rate of corporation tax is $25\%)$