One more piece of information is given than is necessary for solving the problem

One more piece of information is given than is necessary for solving the problem

Identify this unnecessary piece of information. Then solve the problem.

You have $250 to spend and you need to purchase four new tires. If each tire weighs 21 pounds and cost $42 plus $2.50 tax, how much money will you have left after buying the tires?

A parking garage charges $2.50 for the first hour and $0.50 for each additional hour. If a customer gave the parking attendant $20.00 for parking form 10am to 3pm, how much did the garage charge? 

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