Question

You see a shirt for 97 dollars.

Answer 1

When you paid $97.00 for the shirt you should have given each parent $48.50 for the purchase of the shirt, which would = $97.00. 

Then add the $1.00 each you returned from the change. At this point you should have $99.00 as your total. 

Finally add the $1.00 that you kept, which should give you $100.00. 

In the end you still owe your parents an additional .50 cents each for your initial purchase of the shirt.