1. Find the discount rate for a watch originally priced at 5990 and now on sale for 5091.50. Calculate the discount amount: $$5990 - 5091.50 = 898.50$$ Calculate the discount rate: $$\text{Discount Rate} = \left(\frac{898.50}{5990}\right) \times 100 = 15\%$$ 2. Calculate discount and total payment for Camel who bought 3 boxes of mango bars at 37 each and 5 packs of cashew nuts at 150 each with a 3% discount. Calculate total price before discount: $$3 \times 37 + 5 \times 150 = 111 + 750 = 861$$ Calculate discount amount: $$861 \times 0.03 = 25.83$$ Calculate total price after discount: $$861 - 25.83 = 835.17$$ 3. Calculate amount paid by Nick who availed a discount of 19.30 at a 2% rate. Calculate original price: $$\text{Original Price} = \frac{19.30}{0.02} = 965$$ Calculate amount paid: $$965 - 19.30 = 945.70$$ 4. Calculate discount amount and discount rate for a calculator originally priced at 13575 sold at 11267.25. Calculate discount amount: $$13575 - 11267.25 = 2307.75$$ Calculate discount rate: $$\left(\frac{2307.75}{13575}\right) \times 100 = 17\%$$ 5. Calculate markup price and selling price for an appliance center paying 25990 with a 10% markup. Calculate markup amount: $$25990 \times 0.10 = 2599$$ Calculate selling price: $$25990 + 2599 = 28589$$