A bike cost $200 but is reduced by 30% in a sale. how much is the bike reduced by? what does it cost in the sale i want full solution not only answere

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.