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In an old Palace there are 50 stairs to go on top floor. Each is 20 cm high, 30 cm wide and 60 cm long. If all the stairs are re-plastered at the rate of Rs. 4 per 100 sq.cm. What is the expenditure ?

Correct Answer: Rs. 6000

Explanation:

Total are of all stairs = 50 (20x60 + 30x60)


= 50 (1200 + 1800)


= 50 x 3000


= 150000 sq cm.


Given rate of 100 sq cm = Rs. 4


Then for 150000 sq. cm = ?


=> 4 x 150000/100 = Rs. 6000


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