The second sentence means you have exactly $20 and you wish to stress that it's a small amount. The other three all mean you have between $0 and $20. The third version is less common but certainly correct.
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AvangiThe second sentence means you have exactly $20 and you wish to stress that it's a small amount. The other three all mean you have between $0 and $20. The third version is less common but certainly correct. You might use it with a pause after, "I have - - " while you check to see.Thanks, Avangi.
Grammar GeekI agree with Avangi.Thanks, GG.
The first and third are the same. The second says you have exactly $20. The first and third imply you could have less.
Grammar GeekNothing more than 41 years of exposure to American English.Thanks, GG.