When is revenue earned?

Is revenue earned from the following transactions? Give reasons for your answers.

1. Goods costing $7000 are sold for $9500.

2. Goods costing $7000 are sold for $7000.

3. Goods costing $7000 are sold for $4500.

4. A surveyor sends an account for $15 000 to a builder for work in connection with a subdivision of a block of land.

5. An electrical store provides a free service on a television set during the warranty period. The cost to the

   store was $250.

6. A company receives a dividend of $8000 on one of its investments.

7. Goods costing $1000 are sold for $1600. Instead of paying for the goods, the customer cleans the store's windows. This cleaning is normally carried out by an outside contractor at a cost of $1600.