The red blood cells in a blood sample grows by 10% per hour in first two hours, decreases by 10% in next one hour, remains constant in next one hour and again increases by 5% per hour in next two hours. If the original count of the red blood cells in ?->(Show Answer!)

1. The red blood cells in a blood sample grows by 10% per hour in first two hours, decreases by 10% in next one hour, remains constant in next one hour and again increases by 5% per hour in next two hours. If the original count of the red blood cells in the sample is 40000, find the approximate red blood cell count at the end of 6 hours.

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By: anil on 05 May 2019 02.28 am

Original count = 40,000 In the next 2 hours, it increases by 10% => Blood cell count after 2 hours = $$40,000(1+frac{10}{100})^2=40,000(frac{11}{10})^2$$ = $$40,000 imesfrac{121}{100}=48,400$$ It decreases by 10% in next hour => Blood cell count after 3 hours = $$48,400(1-frac{10}{100})^1$$ = $$48,400 imesfrac{9}{10}=43,560$$ It remains constant in the next hour, => Blood cell count after 4 hours = $$43,560$$ In the next 2 hours, it increases by 5% => Blood cell count after 6 hours = $$43,560(1+frac{5}{100})^2=43,560(frac{21}{20})^2$$ = $$43,560 imesfrac{441}{400}=48,024.9approx48,025$$ => Ans - (C)

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MCQ-> Cells are the ultimate multi-taskers: they can switch on genes and carry out their orders, talk to each other, divide in two, and much more, all at the same time. But they couldn’t do any of these tricks without a power source to generate movement. The inside of a cell bustles with more traffic than Delhi roads, and, like all vehicles, the cell’s moving parts need engines. Physicists and biologists have looked ‘under the hood’ of the cell and laid out the nuts and bolts of molecular engines.The ability of such engines to convert chemical energy into motion is the envy nanotechnology researchers looking for ways to power molecule-sized devices. Medical researchers also want to understand how these engines work. Because these molecules are essential for cell division, scientists hope to shut down the rampant growth of cancer cells by deactivating certain motors. 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