Greater Than Operator in field expressions

I was trying to define a conditional to determine a deposit amount for a bill. If the bill is greater than $2000, the deposit is $1000. If the bill is less than $2000, then the deposit is 50% of the bill amount. Can I create this expression in the visual builder? I tried but it didnt work. the <= operator causes an error when the expression is written to the html code.
Thanks
Rick