A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thick

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A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weight 8g/cm^3 then the weight of the pipe is:

A. 3.6 kg
B. 3.696 kg
C. 36 kg
D. 36.9 kg