The hotel charges 0.20 per minute to use the meeting room phone.
This per-minute rate can be converted to the hourly rate using the conversion 1 hour = 60 minutes, as shown below.
×=Thus, the hotel charges
(0.20×60) per hour to use the meeting-room phone.
Therefore, the cost c, in dollars, for h hours of use is
c=(0.20×60)h, which is equivalent to
c=0.20(60h).Choice B is incorrect because in this expression the per-minute rate is multiplied by h, the number of hours of phone use.
Furthermore, the equation indicates that there is a flat fee of
60 in addition to the per-minute or per hour rate.
This is not the case.
Choice C is incorrect because the expression indicates that the hotel charges
() per hour for use of the meeting room phone, not
0.20(60)per hour.
Choice D is incorrect because the expression indicates that the hourly rate is
times the per-minute rate, not 60 times the per-minute rate.