The purchase price of a natural​ gas-fired commercial boiler​ (capacity X) was ​$ eight years ago. Another boiler of the same basic​ design, except with capacity ​X, is currently being considered for purchase. If it is​ purchased, some optional features presently costing ​$ would be added for your application. If the cost index was for this type of equipment when the capacity X boiler was purchased and is ​now, and the applicable cost capacity factor is ​, what is your estimate of the purchase price for the new​ boiler?