<|system|>
Expand $(x+10)(2y+10)$.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
We apply the distributive property repeatedly:

\begin{align*}
(x+10)(2y+10) &= x(2y+10) + 10(2y+10)\\
&= x\cdot 2y + x\cdot 10 + 10\cdot 2y + 10\cdot 10\\
&= 2xy + 10x + 20y + 100.
\end{align*}