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Average cost of water inrease

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by bhumika.k.shah » Sun Jan 31, 2010 2:21 am
The total cost of water for one year in Community Z of 120,000 homes is $75,000. If the cost were to increase to $80,000 for the community, by approximately what percent would the average cost of water increase for each household in Community Z ?

A.70%
B.13%
C.7%
D.5%
E.1.3%
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by thephoenix » Sun Jan 31, 2010 2:26 am
IMO C

avg cost old=75/120=5/8

abg cost new =80/120=2/3

%=[[2/3-5/8]/(5/8)]*100=20/3=6.6=approx 7
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by ajith » Sun Jan 31, 2010 2:30 am
bhumika.k.shah wrote:The total cost of water for one year in Community Z of 120,000 homes is $75,000. If the cost were to increase to $80,000 for the community, by approximately what percent would the average cost of water increase for each household in Community Z ?

A.70%
B.13%
C.7%
D.5%
E.1.3%
the increase in total cost = 5000 $
% increase = 5000/75000*100 = 1/15*100 =6.67%

since this is distributed among same 120,000 families
% increase per family will also be 6.67%

C, I agree with Phoenix
Always borrow money from a pessimist, he doesn't expect to be paid back.
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