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`6/13` of the cookies in a bakery are mint cookies.
`1/3` of the remaining cookies are lemon cookies.
The rest of the cookies are 840 peanut butter cookies.
Each mint cookie sells for 60 cents, a lemon cookie will sell for 50 cents and a peanut butter cookie will sell for $1.20.
How much more money will the bakery collect from the sale of all the peanut butter cookies than from the sale of all the mint cookies?