Can you provide an in-depth solution for: Theo bought a pen for $2 and a piece of paper that cost $1 less than three times the price of the pen. She gave the cashier $10. What is the amount of change Theo received?Hey there, could you help me solve this math problem: Theo bought a pen for $2 and a piece of paper that cost $1 less than three times the price of the pen. She gave the cashier $10. What is the amount of change Theo received?