Hi, I do not totally understand the context of the question, but this gives major interest per year vibes, so if you pay 7% interest on 750 for 3 years, you will ( if the price is added to the total amount you pay interest on ) pay 52.50 the first year, 56.18 (56.175) the second, and 60.11 the last, to total up to ABOUT 918.79.
Hope this helps, if not, comment down below please!!!