A blacksmith have big iron ball of diameter
36cm. He first formed four identical
cylindrical rod out of this ball for some
construction work. When he finished his
work with the cylindrical rod, he again
mixed all the iron rod and formed some
identical small balls, each of radius 9cm.
What is the cost price of steel coating of a
cylindrical iron rod at the rate of Rs.3.5per
100cm2
?
(a) Rs.79.20
(b) Rs.89.20
(c) Rs.85.56
(d) Rs.71.28
Answer:
ans is b 89.20
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