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

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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?

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 $= 5 \times \text{GH¢}4,000.00 = \text{GH¢}20,000.00$
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 $= 5 \times \text{GH¢}3,000.00 = \text{GH¢}15,000.00$
Calculate the savings.
Savings = (Cost of 5 units of T) - (Cost of 5 units of S)
Savings $= \text{GH¢}20,000.00 - \text{GH¢}15,000.00 = \text{GH¢}5,000.00$
The correct option is B.
$\boxed{\text{B. GH¢}5,000.00}$
9. Write 73,843 to 2 significant figures.
Identify the first two significant figures.
In 73,843, the first significant figure is 7 and the second is 3.
Look at the digit immediately to the right of the second significant figure.
The digit is 8.
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.
Write the rounded number.
$73,843 \approx 74,000$
The correct option is B.
$\boxed{\text{B. } 74000}$
10. Express 86.90847 correct to 3 decimal places.
Identify the digit in the third decimal place.
In 86.90847, the third decimal place is 8.
Look at the digit immediately to the right of the third decimal place.
The digit is 4.
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.
Write the rounded number.
$86.90847 \approx 86.908$
The correct option is D.
$\boxed{\text{D. } 86.908}$

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

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Step-by-step solution

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

Calculate the cost if 5 units of brand 'S' were bought.

Calculate the savings.

Identify the first two significant figures.

Look at the digit immediately to the right of the second significant figure.

Round based on the digit identified in Step 2.

Write the rounded number.

Identify the digit in the third decimal place.

Look at the digit immediately to the right of the third decimal place.

Round based on the digit identified in Step 2.

Write the rounded number.

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