This is the 4981st most frequent Korean word.
금액은
"The amount."
In this sentence, '금액은' emphasizes the subject of the sentence—the total monetary amount.
총 합계 금액은 5000원입니다.
The total sum amount is 5000 Korean won.
Here, '금액은' indicates the change in monetary amount due to the discount.
할인 후 금액은 3000원입니다.
The amount after the discount is 3000 Korean won.
'금액은' specifies the membership fee amount as the key topic of the sentence.