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I forgot exactly how it was written but trying to recall and

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Senior Manager
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I forgot exactly how it was written but trying to recall and [#permalink] New post 14 Mar 2007, 02:14
I forgot exactly how it was written but trying to recall and write it here...

A machine's maintenance cost every day while producing one unit is m dollar and n cents. If the machine runs 7 days a week and produces r units, how much is the total maintenance cost of that machine for 7 days for r units?
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 [#permalink] New post 14 Mar 2007, 03:15
something seems missing but lets give a try :wink:

A machine's maintenance cost every day while producing one unit is m dollar and n cents. If the machine runs 7 days a week and produces r units, how much is the total maintenance cost of that machine for 7 days for r units?

in case you are saying that r units per day then then answer will be

USD 7.r. (100m+n)/100

but if you mean to say total r units production in 7 days-as this appears from your question then....

it will be r.(100m+n)/100

explanation.

per unit per day maintainance cost of machine is usd (100m + n)/100

now total production for 7 days is r units... so production for 1 day will be r/7 units.

now per day cost of r/7 units per days will be r*(100m+n)/700

and for 7 days it will be r*(100m+n)/100

kindly correct me if I am wrong.

regards,

Amardeep
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 [#permalink] New post 14 Mar 2007, 03:25
I don't remember the correct answer but it had 7 in it and r is the total no. of units produced per week.....my answer was same except for dividing by 100...but it was wrong.
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 [#permalink] New post 14 Mar 2007, 17:59
Oh I've seen this problem before.

The answer is

(700m + rn)/100

It makes sense cuz the above is equal to 7m + (rn)/100

:-D
  [#permalink] 14 Mar 2007, 17:59
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