Question

A person makes his 40 items at 20% of the cost price. He sells 10 items at a 10% discount and 20 items at 15% discount on
the marked price. What is the maximum discount he can offer on the remaining items if he still gets some profit

Answer 1

The cost of making 40 items is 800 percent without the knowledge of total profit.
We get 90 percent by 10 plus 20 percent by 85 at 900 percent plus 1700 percent to 2600 percent.

The marked price is unknown.
He can sell the rest at a negative price already at 1800 percent over the cost to make the goods and products.