Ok. so they altogether paid 154$ and we should first find out the cost of just the months without the software package. So, they brought 2 software packages which equals $40( 2x$20=$40) so, we will subtract $40 from $154 which equals $114 ($154-$40=$114) so. we now know that we have 6 months (1+5=6) of gameplay so, we should divide $114 by 6 which equals $19.
So, (after all of that babbling) one month of gameplay cost $19
