When a contract includes an option to buy additional goods or services, when does that option give rise to a o Is variable consideration included in the calculation of a contract's transaction price? If so, how is the amount of 1How are sellers constrained from recognizing variable consideration, and under what circumstances does the 2 Is a customer's right to return merchandise a performance obligation of the seller? How should sellers accourt performance obligation? variable consideration estimated? constraint apply? for a right of return? What is the difference between a principal and an agent for determining the amount of revenue to recognize? Under what circumstances should sellers consider the time value of money when recognizing revenue? When should a seller view a payment to its customer as a refund of part of the price paid by the customer for the seller's products or services? What are three methods for estimating stand-alone selling prices of goods and services that normally are not sold separately? When is revenue recognized with respect to licenses