A cylindrical rod is 30cm long and 1.4cm thick.
Find the cost of the rod at Rs 45 per kg. The metal rod weighs 10 grams per cu. cm.....

Dear Student,
Please find below the solution to the asked query:
We have, h=30 cm, r=1.42=0.7 cmVolume of the rod=πr2h=227×0.7×0.7×30=46.2 cm3 Weight of the rod=46.2×10=462 g=0.462 kgThe cost of the rod=0.462×45=Rs 20.79
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