exam Maths Puzzle Numerical Ability

y=10e-[-ln(1/2)/21.77](19)

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I need help solving a math problem. The only thing is, is that the teacher wanted us to us the augmented way. This is in chapter 4-8 in my prentice hall text book.
the problem is: Your help with this would be greatly appreciated.

A charge account had a balance of $655 on June 1. A purchase of $98 was made on June 17, and a payment of $250 was made on June