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A cable is being laid from one side of a swamp, at point A, to the other side, at point D. If laying cable costs $500 per mile on dry land and $800 per mile in the swamp, how much is saved by laying cable on ABD route rather than the ABCD route?a) $700
b) $1000
c) $1,500
d) $3,200
e) $4,700
[Reveal] Spoiler:
I'm getting answer as E can someone explain where I'm wrong?