The annual profit rate of bitcastle Earn is calculated based on the amount of funds deposited and the storage period. For example, if a user deposits 1000 USDT in a fixed deposit for 180 days, the annual profit rate is 5%. The calculation formula is as follows: Annual Profit Rate (APR) = deposited amount x interest rate/365 x storage period = 1000 x 5%/365 x 180 = 24.65 USDT.
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