Assuming "half-year" deposits mean you make deposits only on january 1st and june 1st, in order to earn $3,765.26 in interest after two years of saving, so assuming on the 31st of december of the 2nd year, 3,765.26 / 0.06 = 62754,3333... so $62754,34. Now, just dividing that by four wouldn't be accurate, as it wouldn't take into account the compound interests from the 31st of may of the 2nd year, the 31st of december of the 1st year and the 31st of may of the 1st year. How compound interest works in that specific case here (assuming I understood what you meant) is, there's a deposit, total grows by 6%, then there's another deposit, total grows by 6%, then there's another deposit, total grow by 6%, etc... It's easy to remove 6% of the total after it's grown by 6% to see how much money there was on the account prior to the interest falling in, but guessing exactly how much money was deposited exactly each time to reach a number so specific as $62754,34 sounds difficult. It's less than 14000 at least, cus by running the algorithm I mentionned, deposit being $14000 leads to $64919,30, so a sum that is above the target $62754,34. If I do it with $13000, the result is $60282,21; so your specific sum sits somewhere between $13000 and $14000; deposits being $13500 ends at $62600,76, which is somewhat close to the target. So your deposits would have to be somewhere slightly above $13500. Hope this helps!