Answer:
Tony has no error.
Step-by-step explanation:
The question says, you multiply 2×3, 1×3, and 9×3, then add the products, Therefore the reader made an error.
But if you would like to know the reader's error, it's that they forgot to add 0's when multiplying. As in they were supposed to multiply 200×3, 10×3 and 9×3.