Consider the same four projects in Problem 9, that is : Given we have a hard budget constraint that the total investment cannot be higher than $300,000, after creating the capital budgeting optimization model in Excel, answer the following questions: What is the total required investment in the optimal solution? \$ (enter an integer value with or without the thousand comma separator) What is the total NPV of the projects in the optimal solution? \$ (enter an integer value with or without the thousand comma separator) What is the combined profitability index of the optimal solution? (enter your value in the x.xx format)