Larkspur Windows manufactures and sells custom storm windows for three-season porches. Larkspur also provides installation service for the windows. The installation process does not involve changes in the windows, so this service can be performed by other vendors. Larkspur enters into the following contract on July 1, 2017, with a local homeowner. The customer purchases windows for a price of $2,290 and chooses Larkspur to do the installation. Larkspur charges the same price for the windows irrespective of whether it does the installation or not. The customer pays Larkspur $1,990 (which equals the standalone selling price of the windows, which have a cost of $1,150) upon delivery and the remaining balance upon installation of the windows. The windows are delivered on September 1, 2017, Larkspur completes installation on October 15, 2017, and the customer pays the balance due.

A) Larkspur estimates the standalone selling price of the installation based on an estimated cost of $440 plus a margin of 20% on cost.

B) Given uncertainty of finding skilled labor, Larkspur is unable to develop a reliable estimate for the standalone selling price of the installation.