Question 48
Professor Abacus has written his lavagna due to natural numbers, resulting in the appearance of labor. The wrong product cancels the number and replaces it with the product below $1$ and the same price. Please do not cancel this question and replace it again with the product below $1$ and the current product. Finally, if you think a little, cancel it and write to the loro posto la loro somma, cioè $1309$. How much was the sum of the part number worth?