Lowry sells bonsai. A small bonsai costs $30 and a big bonsai costs $20. If he sold 3 small bonsai and 5 big bonsai, how much did he earn? Let's think first. Chain of thought:
Lowry earns $30 x 3 = $90 from selling 3 small bonsai. He earned $20 x 5 = $100 from selling 5 big bonsai. Therefore, the total amount he earned is $100 + $90 = $190.
Therefore, the answer is 190.