Question 692956
You can plug in answer choices to see which is best.  That would take some time.  Or you can set up an equation.  For ABC the fee is 24 + .03x where x is the number of minutes.  For XYZ it's 12+.05x where x is the number of minutes.<P>
XYZ is a better deal when it's cheaper, or less than, ABC.  So solve for x in 12+.05x < 24+.03x  (Subtract 12 from both sides and subtract ,03x from both sides.)<P>
.02x < 12  (divide both sides by .02) ---> x < 600

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