A shop sells soccer balls at a Selling Price of $100 per ball. TheCost per ball i 60% of the Sales Price per ball. The shop is closed during weekends. For a week the sales were: Monday 3 balls, Tuesday 2 balls, Wednesday 4 balls, Thursday 1 ball; Friday 5 balls. Show the following calculation in full:

The week's total income (total sales amount) is invested at a bank at an interest rate of 5% simple interest for a period of 3 years. Calculate the total amount available at the end of the 3 years.