3. What is the single equivalent rate of discount for the trade discounts, 12% and 15% on an item with $3000.00 list price? What is the amount of discount? 4. Find the contribution rate and break even volume for the following case: Rent: $2500 per month Employee salary: $144000 per year Utilities cost: 90 cents per product Raw material cost: 1.80 per pack of two products Selling price: $12 per product