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Sketch a graph of the number of candies for a few hours

  1. Feb 9, 2009 #1
    please help me !!!

    these days i was doing my lab homework , but i am confused one question ,

    1. Consider a candy jar, initially with 1000 candies. You walk past it once each hour. Since you don’t want anyone to notice that you’re taking candy, each time you take 10% of the candies remaining in the jar. Sketch a graph of the number of candies for a few hours.
    2. How would the graph change if instead of removing 10% of the candies, you removed 20%? Sketch your new graph.

    i compute them , then i got the decimal , but i think it is not correct , because the number of candies should be integer , for example , if there are 729 candies remaining in the jar , 729-729*10%= 656.1 , but i think should be 729-720*10% =657, which one is correct ? any hint for that ? how about 20% ?
    the other question is if this graph is point or a line ?
     
  2. jcsd
  3. Feb 10, 2009 #2

    djeitnstine

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    Gold Member

    Re: please help me !!!

    Eventually you will get a decimal, you have to round. Simply plot that graph. So start with 1,000...900...810...729...657...etc... as you've stated there can only be whole candies in the jar. Graph is a line graph.
     
  4. Feb 10, 2009 #3
    Re: please help me !!!

    thanks , Dje, but i still have a question about that, you mean i should do this 1000-1000*10%=900, 900-900*10%=810, 810-810*10%=729 , 729-729*10%=656.1, round 656.1 should be 656 , then 656-656*10%=590.4 , round is 590 , ...... right ?

    what about 20%, same above ,right ?

    thank you !
     
  5. Feb 10, 2009 #4

    djeitnstine

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    Gold Member

    Re: please help me !!!

    Yes that is correct. Simply take the whole part of the number to do your calculations. And indeed the 20% is the same as above
     
  6. Feb 10, 2009 #5
    Re: please help me !!!

    omg... why don't you just use calculate for each point and get over with it?
     
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