Final answer:
The amount of money in the account after 18 years is approximately $629.06.
Step-by-step explanation:
To calculate the amount of money in the account after 18 years, we can use the formula for compound interest: A = P(1 + r/n)^(nt), where A is the final amount, P is the principal amount, r is the interest rate, n is the number of times interest is compounded per year, and t is the time in years.
In this case, the principal amount is $390, the interest rate is 2.7%, and the interest is compounded daily, so n = 365. Plugging in these values into the formula, we get:
A = $390(1 + 0.027/365)^(365*18)
Simplifying this expression, we find that the amount of money in the account after 18 years is approximately $629.06, to the nearest cent.