Profit and loss question

Question

An electronic machine can show correct weight within the range +10….-10 grams.. Nathan used this machine and sells items at the cost price. If he sells only in the form of 400grams packets then what is the maximum loss he can occur. (in %)  

Answer 1

"Cost price" means that is the price that Nathan originally paid per gram of this item. Think about how he might lose money selling items using this machine. Then try and see if you can figure out what is the maximum he can lose. Finally, how does the maximum he can lose compare to what he paid for it? Give it a shot and come back with your attempt at solving this problem if you're still confused.