The ten $20 bills amount to $20 x 10 = $<<20*10=200>>200.

The eight $10 bills amount to $10 x 8 = $<<10*8=80>>80.

The four $5 bills amount to $5 x 4 = $<<5*4=20>>20.

So, Marly has a total of $200 + $80 + $20 = $<<200+80+20=300>>300.

Therefore, she will have $300/$100 = <<300/100=3>>3 pieces of $100 bills

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Marly has ten $20 bills, eight $10 bills, and four $5 bills. If she wants to change her bills to $100 bills, how many pieces of $100 bills will she have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
Marly has ten $20 bills, eight $10 bills, and four $5 bills. If she wants to change her bills to $100 bills, how many pieces of $100 bills will she have?
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