Answer:
Revenue that has been earned by the end of December is $ 140,000
Explanation:
When entity uses the accrual method of accounting, the transaction is recorded as and when it occurs.
The subscription revenue received relates to services to be rendered over 12 months. Therefore the Revenue is recognised as magazines are issued over - time.
From the first issue June to end of December , there exists 7 issues of magazines.
Revenue to be recognised = $240,000 × 7/12
= $ 140,000