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problem on ps The amount of work in a 'HMT' factory

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problem on ps The amount of work in a 'HMT' factory [#permalink] New post 01 Oct 2003, 08:36
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problem on ps
The amount of work in a 'HMT' factory increased by 80% .By how much it is necessary to increase the number of workers if labour productivitiy is increased by 20%?
A.25%
B.30%
C.40%
D.50%
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shubhangi

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 [#permalink] New post 01 Oct 2003, 09:42
shubh since the questions deals with percentages only we safely assume numbers:
Initial (units) Final (units)
Work 100 180
Productivity 100 120

Productivity = total work/total workers (output per woker) Higher this ratio higher will be productivity.

Initial total workers = 100/100 = 1 unit
Final total workers = 180/120 = 1.5 unit
Thus, % increase = (1.5 - 1)/1 = 50%
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vicky [#permalink] New post 01 Oct 2003, 09:47
Thanks a lot!!
actually i was doin it quite similarly but i guess i did mistake in calculations.
Thanks again.
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vicky   [#permalink] 01 Oct 2003, 09:47
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