Calculate the cost if 5 units of brand 'T' were bought.

Here are the solutions to the problems: 8. Two brands of airconditions S and T cost GH¢3,000.00 and GH¢4,000.00 respectively. A company budgeted GH¢20,000.00 to buy air conditioners. If the company bought 5 units of brand 'S' instead of brand 'T', how much did it save? Step 1: Calculate the cost if 5 units of brand 'T' were bought. Cost per unit of brand T = GH¢4,000.00 Cost for 5 units of brand T = 5 × GH¢4,000.00 = GH¢20,000.00 Step 2: Calculate the cost if 5 units of brand 'S' were bought. Cost per unit of brand S = GH¢3,000.00 Cost for 5 units of brand S = 5 × GH¢3,000.00 = GH¢15,000.00 Step 3: Calculate the savings. Savings = (Cost of 5 units of T) - (Cost of 5 units of S) Savings = GH¢20,000.00 - GH¢15,000.00 = GH¢5,000.00 The correct option is B. B. GH¢5,000.00 9. Write 73,843 to 2 significant figures. Step 1: Identify the first two significant figures. In 73,843, the first significant figure is 7 and the second is 3. Step 2: Look at the digit immediately to the right of the second significant figure. The digit is 8. Step 3: Round based on the digit identified in Step 2. Since 8 is 5 or greater, we round up the second significant figure. The 3 becomes 4. All digits to the right become zeros. Step 4: Write the rounded number. 73,843 ≈ 74,000 The correct option is B. B. 74000 10. Express 86.90847 correct to 3 decimal places. Step 1: Identify the digit in the third decimal place. In 86.90847, the third decimal place is 8. Step 2: Look at the digit immediately to the right of the third decimal place. The digit is 4. Step 3: Round based on the digit identified in Step 2. Since 4 is less than 5, we keep the digit in the third decimal place as it is (8 remains 8). All digits to the right are dropped. Step 4: Write the rounded number. 86.90847 ≈ 86.908 The correct option is D. D. 86.908