Answer: it's an extra charge. If the express delivery cost of your company's mailing documents is 12 yuan, our company will add 20% of the service fee when mailing on behalf of you, and the total charge is 14 yuan.
Answer: It's an extra charge. If the express cost of your company's mailing documents is 12 yuan, we will add 20% of the service charge when mailing them for you, and the total charge will be 14 yuan.