What is the net price and the net price factor of 425.80 at 18/15/5 and how did you get the answer.

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Your 18/15/5 number does not look right. 18 is the percentage of discount. 15 is the number of day to pay within the discount period and 5 is the number of days when the payment needs to be paid in full. Normally it would look like this: 2/10/30 where 2 is the percentage of the discount, 10 is the number of days to pay within the discount period, and 30 is the number of days to pay in full.