On January 1, 2015, ECT Co. adopted the dollar-value LIFO method for its one inventory pool. The pool's value on this date was $600 million. The 2015 and 2016 ending inventory valued at year-end costs were $702 million and $840 million, respectively. The appropriate cost indexes are 1.08 for 2015 and 1.20 for 2016. Required: Calculate the inventory balance that ECT Co. would report on its year-end balance sheets for 2015 and 2016, using the dollar-value LIFO method.