Peter works as a teaching assistant and gets paid on a weekly basis. He gets paid \(D\) dollars per hour for the first

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Peter works as a teaching assistant and gets paid on a weekly basis. He gets paid \(D\) dollars per hour for the first \(30\) hours and \(D+ 10\) dollars per hour for the hours worked in excess of \(30\) hours. What is the value of \(D?\)

(1) Last week Peter worked for \(32\) hours.
(2) Peter got paid \(\$8(D+10)\) more if worked for \(40\) hours instead of \(32\) hours.

Answer: E

Source: e-GMAT
Source: — Data Sufficiency |