If 50 big boxes are fit 4 small boxes each, the number of small boxes is 4*50 = <<50*4=200>>200

Since the small boxes have 40 candles each, there are 40*200 = <<40*200=8000>>8000 candles in total.

# Answer

8000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Four small boxes can fit in one big box. If 50 big boxes can fit four small boxes each, each having 40 candles, calculate the total number of candles in all small boxes.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8000
Four small boxes can fit in one big box. If 50 big boxes can fit four small boxes each, each having 40 candles, calculate the total number of candles in all small boxes.
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