Confusion over wording of a question of arithmetic progression

Question

In the highlighted part part is 15,000 given An or Sn?

Answer 1

They ask for $S_n$.

In situations like this, you can look at previous questions for clarity.

In questions "I" and "II," they ask for the production in the $1^{st}$ year and $12^{th} year$ which clearly mean $A_n$ because they ask specifically for those years.

In the question that you circled, they use the word "total production" meaning all the production combined up to that point. Otherwise, they would have followed the pattern of questions "I" and "II" in which they don't use the word "total".