exam Maths Puzzle Numerical Ability

A worker charges $30 for a 2 hour job. He charges $94 for a 4 hour job. How much would he charge for an 8 hour job?

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exam Other Question
(9.29x)(90.4x)...would any body care to answer this??? please help with proof

given triangle psr is a right triangle with altitude sq drawn to hypotenuse pr

prove pr/ps =ps/pq



thanks