Prepare any necessary adjusting entries at December 31, 2017, for Piper Company's year-end financial statements for each of the following separate transactions and events.
1. Piper Company records a year-end entry for $10,000 of previously unrecorded cash sales (costing $5,000) and its sales taxes at a rate of 4%.
2. The company earned $50,000 of $125,000 previously received in advance and originally recorded as unearned services revenue.