Hardware Store

Aman has a hardware store in Una. One day when he went down to the store room to fetch a box of nails. He found that the price tag had faded out. The first and the last digits of the price were not readable. Although, the number of nails in the box could be read clearly. The box read, 72 nails, Rs. _679_ What were the two faded digits, and what was the price of one nail? Aman’s friend Arnab has