You need $2,000 right now. Your grandfather is willing to lend it to you. He knows you will be good for it, and knows you have a promising career ahead of you. But since he is on a fixed income, he needs you to pay it back with interest. You grandfather expects you to pay back $2,436 in 2 years once you are well established in your career. What interest rate does that imply? (Please enter your response without the % sign - e.g. 10.25% should be entered as 10.25.)