A boy saw a shirt for $97 but does not have enough cash. So he borrowed $50 from his mom and another $50 from his dad. He bought the shirt, and got back $3 as change. He gave his dad $1 and his mom $1 and kept the other $1 for himself. Now mom and dad paid $10 each and got back $1 each. So they paid $49 each, totaling $98. The boy has another $1, adding up to $99. Where is the missing dollar?