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The demand equation for rubies at Royal Ruby Retailers is q+3/4p=60 whereqis the number of rubies RRR can sell per week atpdollars per ruby. RRR

The demand equation for rubies at Royal Ruby Retailers is

q+3/4p=60

whereqis the number of rubies RRR can sell per week atpdollars per ruby. RRR finds that the demand for its rubies is currently25rubies per week and is dropping at a rate of one ruby per week. How fast is the price changing? (Round your answer to the nearest cent.)

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