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plumber charges

by sanju09 » Wed Mar 04, 2009 5:21 am
The amount that a plumber charges for a service call that is h hours long is shown in the graph attached. The charges for a service call consist of an initial amount plus a charge for each hour of work. According to the graph, what is the hourly charge?

(A) $25.00
(B) $37.00
(C) $40.00
(D) $50.00
(E) $75.00
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by bluementor » Wed Mar 04, 2009 5:32 am
Total charge = (Initial, I) + (Hourly charge, h)*(total hours, t)

At t=1:
75 = I + h*(1) ..eqn 1

At t=2:
125 = I + h*(2) ..eqn 2

eqn 2 - eqn 1:
h = 50.

Choose D.

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