Your asset management firm has been amazingly successful, and you have decided to buy yourself a Porsche 911. The MSRP is $85,000, but you have negotiated a cash price of $80,000. Alternatively, the Porsche dealer is willing to offer a zero-interest loan for the remaining the full MSRP to be paid back in equal installments over 36 months. Finally, your bank will finance the car at an annual interest rate of 10% (or 10%/12 per month for 36 months). Should you borrow from your bank at 10% and get the cash price or take the dealer financing? Please show excel sheet and formulas.