Final answer:
Keith's monthly lease payments will be around $123.34 less than his monthly purchase payments.
Step-by-step explanation:
To calculate how much less Keith's monthly lease payments will be than his monthly purchase payments, we need to compare the two options. Let's start with the monthly purchase payments:
Using the formula for calculating monthly payments on a loan:
Monthly Payment = (Loan Amount * Monthly Interest Rate) / (1 - (1 + Monthly Interest Rate)^(-Number of Payments))
For the purchase option, the loan amount is $10,000, the interest rate is 7% (convert it to 0.07), and the number of payments is 3 years = 36 months. Plugging in these values in the formula gives us:
Monthly Purchase Payment = ($10,000 * 0.07) / (1 - (1 + 0.07)^(-36))
Solving this, the monthly purchase payment is approximately $314.59.
Now let's calculate the monthly lease payment:
Since the residual value of the vehicle at the end of the lease is $5,000, the lease amount is $10,000 - $5,000 = $5,000. Using similar calculations as above, we get the monthly lease payment to be approximately $191 25.
Therefore, the difference between Keith's monthly lease payments and monthly purchase payments is approximately $314.59 - $191.25 = $123.34.