Suppose that you deposit money into a savings account that receives 5% interest per year on the amount of money that
is in the account for that year.
Assume that you deposit $400 into the account initially.
Determine, to the nearest year, how long it will take for the
initial investment of $400 to double.
Write the number of years in the blank.
Type your answer as a number only, no letters or spaces or
other characters.