Answer:2000
Step-by-step explanation:I think
Read https://www.wyzant.com/resources/answers/2997/how_do_you_figure_out_how_to_determine_the_best_method... and I think that will answer your question (:
If 7 minutes is $2.45, then 13 minutes is $4.55 cuz 1 minute is 0.35 cents
The answer is 11 I hope this helped you