Tyrone is comparing mobile phone plans. the plans are as follows: plan a: $95 for unlimited talk time and text messaging plan b: 10 cents per minute for talk and 5 cents per text message plan c: $20 monthly fee plus 5 cents per minute for talk and 5 cents per text message plan d: $45 monthly fee with the first 500 minutes of talk free, then 10 cents per minute after that, along with unlimited text messages. if tyrone talks for 800 minutes each month and uses 1000 text messages, which plan is least expensive for him? plan a plan b plan c plan d