Answer:
The charge applied by company for calling 1300 minutes is $26
Explanation:
Given as :
The charge applied by company for calling 1250 minutes = $25
The total calling used by John's = 1300 minutes
Let the charge applied by company for calling 1300 minutes = $x
Now, According to question
∵ The charge applied by company for calling 1250 minutes = $25
or, The charge applied by company for calling 1 minute =

∴ The charge applied by company for calling 1300 minute =
× 1300
i.e x =

Or, x = $26
So, The charge applied by company for calling 1300 minutes = x = $26
Hence,The charge applied by company for calling 1300 minutes is $26 Answer