exam Maths Puzzle Numerical Ability

please help with proof

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

prove pr/ps =ps/pq



thanks

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exam Other Question
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? Antonella bought some calculators for a total of $240. She kept one for herself and sold the rest for $300 making a profit of $5 on each calculator. How many calculators did she buy?

an equation for this pls?? anyone??