Question 1187996
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A phone company offers two monthly plans. 
Plan A costs $15 plus an additional $0.15 for each minute of calls. 
Plan B costs $26 plus an additional $0.13 for each minute of calls. 
For what amount of calling do the two plans cost the same?
What is the cost when the two plans cost the same?
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    15 + 0.15t = 26 + 0.13t  (where t is the amount of calling time)


From this equation


    t = {{{(26-15)/(0.15-0.13)}}} = 550 minutes.


The common costs  is  15 + 550*0.15 = 97.50  dollars.
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Solved.