Express plan a as an equation where c equals thee cost and m equals the minutes used

A cell phone company offers 2 talk and text plans. The company charges a monthly service fee of $20 for either plan the customer chooses:

Customers that choose plan A are charged 5 cents a minute and $20 for texts in addition to the monthly service fee

Customers that choose text plan b are charged 10 cents a minute (first 100 minutes free) and $15 for 200 texts. the equation c = .10 (m – 100) + 15 + 20 can be used to represent how much a customer would spend monthly for the minutes used.

1. Express plan a as an equation where c equals thee cost and m equals the minutes used
2. For how many minutes wil both plans share the same cost? Show your work algebraically.

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