A owes B among other debts 1 000 rupees upon a promissory note which falls due on the first June He ...........

A owes B, among other debts, 1,000 rupees upon a promissory note, which falls due on the first June. He owes B no other debt of that amount. On the first June A pays to B 1,000 rupees.

The payment is to be applied to the discharge of the promissory note

The payment is to be applied equally to all the debts owed by A