You went shopping with your family and you wanted to buy a $97 sweater. You ask your mom for $50 and your dad for $50. You buy the sweater and get $3 change. You give $1 to your mom and $1 to your dad and keep $1 for yourself. Now you owe your mom $49 and your dad $49 that equals $98 in total plus your dollar making it $99. What happened to the other dollar?
Comment if you think you know the answer.