kmf229

if you pay in 10 days  you get a 2% discount, otherwise in 45 days you are to pay the whole amount.
so if you did not take the discount: 2/98 per period more.
you are going to be paying (1+2/98)
annualize this with the annualizing factor being 365/35
35=4510
so answer: (1+2/98)^(365/35) =1.2345 1 = 23.45%