The unadjusted trial balance showed on December 31, 2011 Subscription Revenue of P390,000. A magazine subscription costs P100 monthly and is payable in advance either quarterly or semi annually. Deliveries are made on or before the 15th of the month. A review of the subscription contracts revealed the ff:

September 1
No of quarterly subscriptions: 100
No. of semi annual: 100

October 1
No of quarterly subscriptions: 200
No. of semi annual: 100

November 1
No of quarterly subscriptions: 300
No. of semi annual: 150

Give the adjusting entry on December 31,2011

*haven't figured out any solution yet.

This is not difficult, have a go, it is simple maths a % of This, a % of That and no half baked calculations this time
One assumes that all of December's sales are accrued income