• Project a position's entire debt with simple (non-compounding), time-based interest (C3). The interest base is the full stored principal draw + fee + 200 gas reserve, verified on the fork that interest accrues on the composite, not the net draw.

    interest = principal · rateBips · elapsed / (10_000 · SECONDS_PER_YEAR); entireDebt = principal + interest. At open (elapsedSeconds = 0) → draw + fee + 200.

    The rate is caller-supplied (the global rate for a new position, or getTroveInterestRate for an existing one). The at-open rate-prediction rule (110%-CR max capacity, C4) is out of scope for v1.

    Parameters

    Returns bigint