Final answer:
Dustin can save $160 by taking a 2-year loan at 14% interest instead of 20% interest.
Step-by-step explanation:
Dustin can save $160 by taking a 2-year loan at 14% interest instead of 20% interest. The total repayment for the 20% loan is $2400, while the total repayment for the 14% loan is $2240. Therefore, the savings would be $2400 - $2240 = $160.