Samabi invests N$ 10 000 at 5% simple interest per year. Calculate the interest earned after 3 years.

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17. Calculate the interest earned after 3 years.

Identify the given values.
Principal ( $P$ ) = N $10\,000$
Rate ( $R$ ) = $5\% = 0.05$
Time ( $T$ ) = 3 years
Use the simple interest formula
$I = P \times R \times T$ .
$I = 10\,000 \times 0.05 \times 3$
Calculate the interest.
$I = 500 \times 3$ $I = 1\,500$
The interest earned after 3 years is \boxed{\text{N\ } 1,500}$.

18. Calculate the perimeter of the shape.
Identify the lengths of the sides of the quadrilateral.
The arrows indicate that opposite sides are equal in length.
Side AB = $5 \text{ cm}$
Side BC = $4 \text{ cm}$
Side CD = $5 \text{ cm}$ (opposite to AB)
Side DA = $4 \text{ cm}$ (opposite to BC)
Calculate the perimeter by summing the lengths of all sides.
$\text{Perimeter} = AB + BC + CD + DA$ $\text{Perimeter} = 5 \text{ cm} + 4 \text{ cm} + 5 \text{ cm} + 4 \text{ cm}$
Add the lengths.
$\text{Perimeter} = 18 \text{ cm}$
The perimeter of the shape is $\boxed{18 \text{ cm}}$ .

19. Calculate the area of the triangle.
Identify the base and height of the right-angled triangle.
Base ( $b$ ) = $4 \text{ cm}$
Height ( $h$ ) = $3 \text{ cm}$
Use the formula for the area of a triangle
$\text{Area} = \frac{1}{2} \times \text{base} \times \text{height}$ .
$\text{Area} = \frac{1}{2} \times 4 \text{ cm} \times 3 \text{ cm}$
Calculate the area.
$\text{Area} = 2 \text{ cm} \times 3 \text{ cm}$ $\text{Area} = 6 \text{ cm}^{2}$
The area of the triangle is $\boxed{6 \text{ cm}^{2}}$ .

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