1. Problem: Calculate the 5% discount on a cellular phone worth 12,690. Step 1: Calculate discount = $5\% \times 12,690 = 0.05 \times 12,690$ Step 2: Discount = $634.5$ 2. Problem: Find the discount rate given a discount of 114.40 on a polo shirt costing 880. Step 1: Discount rate = $\frac{114.40}{880} \times 100\%$ Step 2: Discount rate = $13\%$ 3. Problem: Marivic received a 72 discount which is 15% of her total water bill. Find her total bill. Step 1: Let total bill = $x$ Step 2: $15\%$ of $x$ = $72$ means $0.15x = 72$ Step 3: $x = \frac{72}{0.15} = 480$ 4. Problem: Mang Kanor wants to markup 18% on a shirt costing 975. Find the selling price. Step 1: Markup amount = $0.18 \times 975 = 175.5$ Step 2: Selling price = $975 + 175.5 = 1,150.5$ 5. Problem: A refrigerator costs 25,990 and is marked up by 5,717.80. Find the markup rate. Step 1: Markup rate = $\frac{5,717.80}{25,990} \times 100\% = 22\%$ 6. Problem: Markup is 30% with amount 21,567. Find original price. Step 1: Let original price = $x$ Step 2: $30\%$ of $x = 21,567$ means $0.30x = 21,567$ Step 3: $x = \frac{21,567}{0.30} = 71,890$ 7. Problem: Bus fare 780 has 10% discount. Find the discount and amount to pay. Step 1: Discount = $10\% \times 780 = 78$ Step 2: Amount to pay = $780 - 78 = 702$ 8. Problem: Discount of 126.60 is 12% of toy car price. Find original price. Step 1: Let price = $x$ Step 2: $0.12x = 126.60$ Step 3: $x = \frac{126.60}{0.12} = 1,055$ 9. Problem: Markup 3,598 is 20% of tuition fee. Find tuition fee. Step 1: Let tuition fee = $x$ Step 2: $0.20x = 3,598$ Step 3: $x = \frac{3,598}{0.20} = 17,990$ 10. Problem: Laptop bought at 12,995 has 8% markup rate. Find markup and selling price. Step 1: Markup = $0.08 \times 12,995 = 1,039.6$ Step 2: Selling price = $12,995 + 1,039.6 = 14,034.6$