What is $700 plus GST?

Excuse me, could you please clarify something for me? I'm trying to understand the total cost when adding GST to an amount of $700. Could you walk me through how one would calculate the Goods and Services Tax (GST) on top of the base amount of $700? I'm a bit unsure of the specific percentage that GST represents in this context and how it's applied to the original amount. Would you mind explaining the process and the final figure I should expect? Thank you in advance for your assistance.