DS

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Source: — Data Sufficiency |

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by parallel_chase » Mon Sep 01, 2008 8:03 am
$30 basic fee + $20 for each outlet installed.

First statement is clearly sufficient.

Second Statement.

let x be each outlet.

$30 + $20x = $30x
30 = 30x-20x
30 = 10x

x=3

Therefore sufficient.

Hence D.