In order for S(t) to equal to 0, it would take 9 years. If you multiply 9 times the -120, you will get -1080, then you add that to the +1,080 and the answer is 0.
Answer: $2,615 Explanation: The balance of $ 2,056 is a positive number, The deposits of $ 875 is a positive number. The withdrawal of $ 316 is a negative number.