Predict your weekly expenses in retirement.c) What lump sum at retirement will provide an income stream at retirement to enable you tomaintain your desired standard of living assuming you live to your life expectancy

To answer this question, you'll need to follow several steps:

1. Estimate your weekly expenses in retirement: This will depend on your lifestyle and plans for retirement. Consider all your potential expenses such as housing (if you haven't paid off your mortgage), utilities, groceries, healthcare, travel, hobbies, etc.

2. Calculate your annual retirement expenses: Multiply your estimated weekly expenses by 52 to get your annual expenses.

3. Estimate your life expectancy: This is how long you expect to live after retirement. You can use actuarial tables or life expectancy calculators available online for this.

4. Calculate the total retirement expenses: Multiply your annual retirement expenses by the number of years you expect to live after retirement.

5. Consider the impact of inflation: The value of money will decrease over time due to inflation. You can use an inflation calculator online to estimate how much your future expenses will be in today's dollars.

6. Consider your income sources: If you have other sources of income in retirement like social security, pension, rental income, etc., subtract these from your total retirement expenses.

The result will be the lump sum you need at retirement to maintain your desired standard of living. Please note that this is a rough estimate and actual amounts can vary based on various factors. It's always a good idea to consult with a financial advisor for personalized advice.