c) The diagram shows a circle centre O. If POQ = x°, the diameter of the circle is 7cm and the area of the shaded portion is 27.5cm². Find, correct to the nearest degree, the value of x. [Take π = 22/7]

The area of a circle is given by $A = \pi r^2$.

The area of the shaded portion is $27.5 \text{ cm}^2$.
Area of unshaded sector = Total area - Area of shaded portion

The area of a sector with angle $\theta$ is given by $\frac{\theta}{360^\circ} \times \pi r^2$.
Here, the angle of the unshaded sector is $x^\circ$.

The value of $x$ is $\boxed{103^\circ}$.

Sales tax = 10% of the total cost including import duty.

Selling Price (SP) = GHe 660.00.

The percentage profit is $\boxed{30.43\%}$.

Number of successful boys = 50% of 1000 = $0.50 \times 1000 = 500$.
Number of successful girls = 40% of $G = 0.40G$.
Total successful students = $500 + 0.40G$.

48% of the total number of students were successful.
Total successful students = $0.48 \times (1000 + G)$.

Subtract $0.40G$ from both sides:

Subtract 480 from both sides:

Divide by 0.08:

The number of girls in the school is $\boxed{250}$.