A cell phone plan costs $21.70 per month for 700 minutes of talk time. It costs $0.05 per minute for each minute over 700 minutes. To get e-mail access, it costs 10% of the price for 700 minutes of talk time. You bill, which includes e-mail, is the same each month for 5 months. The total cost for all 5 months is $135.35. Write and solve an equation to find the number of minutes of talk time you use each month.