If the government estimated income is 50 million FCFA while her expenditure stands at 65 million FCFA. How much does the government need to finance her activities?

• Government Income $= 50 \text{ million FCFA}$
• Government Expenditure $= 65 \text{ million FCFA}$

The amount needed to finance activities is the difference between expenditure and income.

The final answer is $\boxed{\text{A 15 million FCFA}}$.

Liquid assets are those that can be readily converted into cash without significant loss of value. For a bank, these typically include actual cash and highly marketable short-term securities.

• Notes and Coins in till: This is cash, the most liquid asset.
• Treasury bills: These are short-term government securities, highly marketable, and considered very liquid.
• Investment: This term is too general to be definitively classified as highly liquid without more information (e.g., "short-term marketable securities").
• Advances to customers: These are loans, which are not readily convertible to cash and are therefore not liquid assets.

The final answer is $\boxed{\text{B 55 million FCFA}}$.