Question 170097
A lawyer bills her clients $200 per hour of service. If a client's case requires 39 hours to complete, use proportion to calculate how much the client will owe the lawyer (excluding tax). 
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hrs/charge = hrs/charge
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1/200 = 39/x
Cross-multiply to get:
x = 39*200 
x = $7800
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You are totally right.
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Cheers,
Stan H.