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A company offers you the use of its comp...

A company offers you the use of its computer for a fee. Plan A costs $4 6 to join and then $9 per hour to use the compound. Plan B costs $25 to join and then $2.25 per hour to use the computer. After how many minutes of use would the cost of plan A be the samee as the cost of plan B?

A

18052

B

173

C

169

D

165

Text Solution

Verified by Experts

The correct Answer is:
C
Graph the cost of company A, y=6+9x, and the cost of company B, y=25+2.25x, in a window `x epsi[0,10]` and `y epsi[0,50]`. Use CALC/interset to find the x-coordinate of the point of intersection at 2.8148 hours, the "break-even" point. Multiply by 60 to convert this time to the correct answer choice.
An alternative solution is to solve the equation 6+9x=25+2.25x and multiply the solution by 60 to get the answer of about 169 minutes.
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