Answer:
16.67 years.
Explanation:
Samantha wants to invest $6800 in a savings account that pays 6% simple interest.
Let after y years the amount will be double in value.
So, using the formula of simple interest we can write

⇒

⇒ 6y = 100
⇒ y = 16.67 years.
Therefore, after 16.67 years the amount will become double in value. (Answer)