On april 2, jennifer elston uses her jcpenney company credit card to purchase merchandise from a jcpenney store for $1,200. on may 1, elston is billed for the $1,200 amount due. elston pays $600 on the balance due on may 3. on june 1, elston receives a bill for the amount due, including interest at 3.0% per month on the unpaid balance as of may 3. prepare