$BTC ROI = USDT Income / (100 USDT + Opening Account Balance + Modified Deposit Amount in the Selected Time Interval)

Modified Deposit = Deposit * (Time Between Deposit and End Date of Selected Time Interval, in Seconds) / Total Time of Selected Interval (in Seconds)

For example: if the selected interval is daily, the denominator is 86,400 seconds (24 hours), and the numerator starts from 86,400 (remaining time) and decreases to 0.

When the selected time interval starts, the deposit weight = total deposit amount. After 12 hours, weight = 50%; after 23 hours, weight = 1/24.*