Pau is considering refinancing his mortgage. He has $240$ months left on his current loan at $6\%$ interest and his current principal balance is $$79584.$ The new rate available to him is $2\mathrm{.}5\%$ for a $240$ month mortgage. How much would Pau save on his monthly payments if he decides to refinance? State your answer as a positive number rounded to two decimal points $($e$.$g$.$ if the answer is $$2345\mathrm{.}123,$ write $2345\mathrm{.}12)$