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anonymous

  • 5 years ago

Suppose that at the end of any given year an automobile is only worth 80% of it's value a the beginning of that year. If a car cost 21,000 new, what is it's value at the end of five years?

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  1. dumbcow
    • 5 years ago
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    21000*(1-0.8)^5

  2. dumbcow
    • 5 years ago
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    ignore that post sorry

  3. anonymous
    • 5 years ago
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    lol.

  4. dumbcow
    • 5 years ago
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    21000*(0.8^5) :)

  5. radar
    • 5 years ago
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    1st yr .8x$21000=$16800 2nd yr .8 x 16800=13440 3rd yr .8 x 13440=10752 4th yr .8 x 10752=8601.60 5th yr .8 x 8601.60=$6881.28

  6. anonymous
    • 5 years ago
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    hmmmmm...........

  7. radar
    • 5 years ago
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    Or as dumbcow stated\[21000*.8^{5}\]

  8. anonymous
    • 5 years ago
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    BAM! both of you two were right! I just had to round down. Thanks so much on this one guys!

  9. anonymous
    • 5 years ago
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    A company offers a starting yearly salary of 31,000, with raises of 2,000 per year. Find the total salary over a ten-year period.

  10. anonymous
    • 5 years ago
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    Something tricky about this one, it's like 300k, or 400k sumthin...

  11. dumbcow
    • 5 years ago
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    First find salary at end of ten-year period A10 = 31000+(10-1)*2000 A10 = 49000 Then use series sum formula Sum = 1/2*n*(A1+A10) Sum = 1/2*10*(31000+49000) ...

  12. anonymous
    • 5 years ago
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    .......

  13. dumbcow
    • 5 years ago
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    thats left for you to compute ;)

  14. anonymous
    • 5 years ago
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    I am a bottom line kind of girl..... :)

  15. anonymous
    • 5 years ago
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    It doesn't add up.......hmmm...

  16. anonymous
    • 5 years ago
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    Sigh....

  17. dumbcow
    • 5 years ago
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    what did you come up with?

  18. anonymous
    • 5 years ago
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    Hello.

  19. anonymous
    • 5 years ago
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    Ah well.......I came up with a bunch of letters I don't understand.

  20. dumbcow
    • 5 years ago
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    what do you mean? Sum = 1/2*10*(31000+49000) sum= 5*(80,000) = 400,000

  21. anonymous
    • 5 years ago
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    ....

  22. anonymous
    • 5 years ago
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    SO it's 400k + 80k?

  23. dumbcow
    • 5 years ago
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    where did the 80k come from?

  24. anonymous
    • 5 years ago
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    31+49

  25. anonymous
    • 5 years ago
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    So it's 400K even?

  26. anonymous
    • 5 years ago
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    BINGO!

  27. dumbcow
    • 5 years ago
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    yes sorry for the confusion

  28. anonymous
    • 5 years ago
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    Can you help the other Kelley? Same question, different numbers. Like 6 people are trying it now, and can't help her get this question!

  29. dumbcow
    • 5 years ago
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    um yeah

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