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Parallelogram

A brass tray ...

Question

A brass tray in the shape of a parallelogram was polished at a total cost of Rs 2,250 at the rate of Rs 20 per 10 ${c m}^{2}$ . If the altitude of the parallelogram is 45 cm, find the length of its base.

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Solution

Rate = $\frac{20}{10}$ per cm.
Area of parallelogram $\frac{2250}{2}$ =1125cm

Area of parallelogram =length*height

length = $\frac{1125}{45}$ 25cm

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