Task $4$ A housing project wants to start a program of annual collecting and saving money for a future project. Starting from today will be made $15$ collections. Nowadays the project cost $$500000$ and it will grow at expected yearly $2\%$ inflation rate. The annual collection will be increased yearly $8\%$ and invested at $6\%$ interest rate. Create a model to calculate the yearly collections and the accumulated balance. Make all of these input variables so that a user can use the model for different realistic given values. Assume maximum $20$ years projects.

I need an excel file for this task