Oops! Here'e the exact formula 4 % gain. https://www.investopedia.com/ask/answers/how-do-you-calculate-percentage-gain-or-loss-investment/ (3.01 - .015) / .015 * 100 = 19,966.67% Didn't sleep much last night and knew something not right. If bought @ .01 and went to .02, that's a double or 100% on your investment. (.02 - .01) / .01 * 100 = 100%. (1.50 - .015) / .015 * 100 = 9,900% Just woke-up from a nap. Long & rough week. Ahhh, that's better. :-) P.S. You probably knew that anyway professor.