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Multiple Choice Questions (MCQs)10. A roller is 120 cm long and has diameter 84 cm.If it takes 500 complete revolutions to level aplayground, determine the cost of levelling it atthe rate of 30 paise per m2(a) R 475.40.(r=22)12(b) R 375.45(d) 475.20(c)375.2011. The ratin of t |
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Answer» Surface area of on revolution = 2∏rh= 2 x 22/ 7 x 60 x 84now for 500 revolution = 2 x 22/7 x 60 x 84 x 500=1584 m2now cost leveling 1 m2 = Rs. 0.30= for 1584 m2 = 0.30 x 1584 = Rs. 475 . 20 option d |
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