jerry bought a new sweater that was on sale for 20% off. The original price was $86. How much did jerry spend on the sweater?

The discount amount is $86 x 20/100 = $<<86*20/100=17.20>>17.20.

So, Jerry spent $86 - $17.20 = $<<86-17.20=68.80>>68.80 on the sweater. Answer: \boxed{68.80}.