Final answer:
Katie should deposit $56,135.35 today to have $180,000 in 20 years at a 6% annual interest rate.
Step-by-step explanation:
To find out what Katie should deposit today in order to purchase a condo for $180,000 in 20 years with an annual interest rate of 6%, we can use the formula for the present value (PV) of a lump sum:
, where FV is the future value, r is the annual interest rate (expressed as a decimal), and n is the number of periods (years).
First, we convert the annual interest rate from a percentage to a decimal form: 6% = 0.06.
Next, we plug in the values into the formula:
PV =

Now we calculate the denominator


Then, we can find the PV:
PV = $180,000 / 3.20713547289 = $56,135.35 (approximately)
Therefore, Katie should deposit $56,135.35 today to have $180,000 in 20 years, assuming a 6% annual return.