Task #$7($Mortgage$).$ In the mortgage example, given in class $($Unit $3,$ slides $57-59)$ we calculated the monthly payment. You might be interested which part of this payment is interest and which part is repayment of the debt. Use a spreadsheet to calculate the interest payment, repayment of principal and the loan balance for every month. Draw a graph that shows nicely how the share of interest decreases over time while the share of repayment increases. Task #$8($Rule of $752).$ A website that helps people to make the right nancial decisions has come up with the rule of $752.$ It says that the opportunity cost of $$1$ of weekly expenses during ten years $($in terms of money that you could have instead on your bank account in ten years$)$ is $$752.$ The rule should help you to avoid some bad habits. For example, if you buy a coee to go and a cookie at Starbucks every working day for $$4$ more than it would cost to have a coee and a cookie at home $($almost nothing$),$ you could have instead of this weekly expense of $$20$ a nice amount equal to $$20\backslash$times $752=$ $$15,040$ on your bank account in ten years. The website just states that the author assumed a $7\%$ rate of return on your investment with weekly compounding. How exactly did the author come up with the number of $752?$