Economics
posted by Bob .
V pays 20 cents
V sells to W for 35 cents
W sells to X for 55 cents
X sells to Y for 80 cents
Y sells to Z for $1.00
Contribution to GDP:
(a) 20 cents
(b) $1.00
(c) $1.90
(d) $2.90

Economics 
SraJMcGin
Although this is not my area, the following may help you:
http://www.google.com/search?hl=en&client=firefoxa&rls=org.mozilla:enUS:official&hs=6ae&ei=vPhOSt6lIoPqMcPyxe0D&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=GDB+tutorial&spell=1
Sra 
Economics 
economyst
go with b)
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