| Market Value of Blackacre | $60,000 | $70,000 | $30,000 |
| less Amount of Unpaid Mortgage Note | 40,000 | 30,000 | 20,000 |
| = Value of Equity of Redemption | $20,000 | $30,000 | $10,000 |
Subrogation is a doctrine of equity applied in favor of any person who pays the debt or obligation of another [Blackacre] which is not his personal obligation, not as a volunteer interfering without adequate cause, but to protect an interest of his own [the debt created by the note] or of some other person on request, or in the performance of a secondary obligation as surety. It is a matter of justice and equity that he [Bill] should be placed in the position of the creditor [Louise] to whom he makes payment in order that he may enforce any security [lien on Blackacre] or other rights which the creditor has in connection with such debt.
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