Henry Corporation sells home entertainment systems. The corporation also offers to sell its customers a two-year warranty contract as a separate service. During 2017, Henry sold 20,000 warranty contracts at $99 each. The corporation spent $180,000 servicing warranties during 2017, and it estimates that an additional $900,000 will be spent in the future to service the warranties. Henry recognizes warranty revenue based on the proportion of costs incurred out of total estimated costs. Prepare Henry's journal entries for (a) the sale of warranty contracts, (b) the cost of servicing the warranties, and (c) the recognition of warranty revenue under the revenue approach used for service-type warranties.