How many iron rods, each of length 7 m and diameter 2 cm can be made out of 0.88 m3 of iron?

How many iron rods, each of length 7 m and diameter 2 cm can be made out of 0.88 m3 of iron? Correct Answer 400

Given , diameter, 2r = 2cm radius, r = 1 cm = 1100mATQ, n×πr2h = 0.88⇒n×227×(1100)2×7 = 0.88⇒n = 0.88×100×10022.'. n = 400 
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