I can calculate regular mutual funds, front-load and no-loads, but not back-end loads. How do we do this problem?

Question:

Mutual fund charges 3% front load.
1% total annual fees
2% back-end load which decreases 0.5% per year

How much are the fees paid on a $100 000 investment that does not grow, if cashed out after 3 years of no gain?


Answer:
Need to find the Annual Rate of Return? (0.03)(0.99)(?....

The answer is 682, but how do we solve this problem to get to this result?