Simplify $(2-2i)(5+5i)$, where $i^2 = -1.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify $(2-2i)(5+5i)$, where $i^2 = -1.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
20
Simplify $(2-2i)(5+5i)$, where $i^2 = -1.$
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