His expenses are 80/100 = 4/5.

His profit would be 20/100 = 1/5.

Total sales for the day is $200 x 5 = $<<200*5=1000>>1000.

Total ice cream cones he sells is $1000 / 5 = <<1000/5=200>>200.

# Answer

200
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Marco owns an ice cream truck.  His ice cream cones are $5 each.  If his expenses are 80% of total sales for the day, how many ice cream cones would he need to sell to make a $200 profit for the day?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
200
Marco owns an ice cream truck.  His ice cream cones are $5 each.  If his expenses are 80% of total sales for the day, how many ice cream cones would he need to sell to make a $200 profit for the day?
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