Answer = 125 minutes
Assuming that the customers uses x minutes in a month.
The first plan can be represented as :
• 20+ 0.19x ....... equation 1 .
The second plan can be represented as :
• 25 +0.15x ....equation 2
When we equate both equation , we ca find the minutes of call of two plans :
[tex]20\text{ + 0.19x = }25\text{ +0.15 x }[/tex]
Solving the above equation, we get that :
[tex]\begin{gathered} 0.19x\text{ -0.15x = 25 -20 } \\ \Rightarrow\text{ 0.04 x = 5 } \\ \therefore\text{ x = }\frac{5}{0.04} \\ \text{ = 125 minutes } \end{gathered}[/tex]This means that, for 125 minutes , both option will be equal.
