Final answer:
To determine the annual deposit amount Jamie Lee and Ross will need to make until they retire, we need to calculate the shortfall between their estimated expenses and income needed during retirement. By using the formula for future value of an ordinary annuity, we can calculate the annual deposit amount needed to make up the shortfall. Assuming they have 8 years until retirement, the annual deposit amount is $6,675.93.
Step-by-step explanation:
To determine the annual deposit amount Jamie Lee and Ross will need to make until they retire, we need to calculate the shortfall between their estimated expenses and income needed during retirement.
The first step is to calculate the 80% of their current expenses. Their current fixed expenses are $5,000 per month and variable expenses are $2,900 per month, so their total current expenses are $7,900 per month. Multiplying this by 12 months gives us an annual expense of $94,800. Multiply this by 80% and we get $75,840 per year.
The next step is to calculate the difference between their estimated annual income during retirement and their desired annual income. The estimated income during retirement is not given in the question, so we cannot calculate the exact shortfall. However, we can use the information provided to determine the annual deposit amount needed to make up the shortfall.
Assuming they will need an annual income of $75,840 during retirement, we can calculate the amount they will need to save each year until retirement. The rate of return on their investments until retirement is 4%, so using the formula for future value of an ordinary annuity, we can calculate the annual deposit amount. The formula is:
Annual deposit amount = (shortfall / [(1 + rate of return)^(years until retirement)])
Let's assume they have 8 years until retirement. Plugging in the values, we get:
Annual deposit amount = ($75,840 / [(1 + 0.04)^8])
Simplifying the equation, we get:
Annual deposit amount = ($75,840 / [(1.04)^8])
Calculating this, we get an annual deposit amount of $6,675.93 (rounded to two decimal places).