A wardrobe top is in the shape of a sector of a circle with radius 35 cm and angle 90 degrees. Calculate its perimeter.

The formula for the arc length $L$ of a sector is:

$$L = \frac{\theta}{360^\circ} \times 2\pi r$$

Substitute the given values:

$$L = \frac{90^\circ}{360^\circ} \times 2 \times \frac{22}{7} \times 35 \text{ cm}$$ $$L = \frac{1}{4} \times 2 \times \frac{22}{7} \times 35 \text{ cm}$$ $$L = \frac{1}{4} \times 44 \times 5 \text{ cm}$$ $$L = 11 \times 5 \text{ cm}$$ $$L = 55 \text{ cm}$$

The perimeter $P$ of a sector is the sum of the arc length and two radii:

$$P = L + 2r$$

Substitute the calculated arc length and the given radius:

$$P = 55 \text{ cm} + 2 \times 35 \text{ cm}$$ $$P = 55 \text{ cm} + 70 \text{ cm}$$ $$P = 125 \text{ cm}$$

The perimeter of the top of the wardrobe is $\text{125 cm}$.