Question 156795
Remember: 
Let {{{X=minutes}}}, and
{{{Charge=(Rate)(Minutes)}}}, where {{{Rate=0.20/minute}}}
Then,
{{{14.40=(0.20/minute)(X)}}}
{{{cross(14.40)72/cross(0.20)=cross(0.20)X/cross(0.20)}}}
{{{X=72Minutes}}} --------------> minutes used that month
*Note: if you multiply {{{72Minutes}}} by {{{rate =0.20/minute}}} that equals to $14.40.
Thank you,
Jojo