Take a few minutes to use a trial-and-error approach with the spreadsheet to develop your best guess for the optimal solution. What is the total amount invested for your solution

In this question, we lack both the spreadsheet and the information about the solution. Therefore, we cannot answer this question fully. Nevertheless, we are able to provide information on the trial-and-error approach, so that it will help you solve this question on your own.

Trial-and-error is a problem-solving method in which a solution is reached after multiple attempts to do so. The way in which a solution is reached through this method is by trying a method, observing how it works, and trying a new method when it does not lead to a solution. This is the most common method of learning employed by organisms around the world.

6e14 is the answer.