Answer the following question based on the dialogs.

Clerk: Good afternoon. What can I do for you?

Ardy: Good afternoon. I'd like to send this package. Could you please tell me how much I should pay for the delivery service?

Clerk: Where will you send this package?

Ardy: Malang.

Clerk: To find out the fee for the delivery service, I will weigh the package first.

Ardy: Yes, please.

Clerk: It is 1.2 kilograms, so you need to pay for Rp30,000 for the delivery service.

Ardy: O.K. How many days will the package arrive at the destination?

Clerk: About three to four days.

Ardy: Will you be responsible if there is any damage during the delivery process?

Clerk: Yes, we are professional and have established for many years, so we will be responsible for everything that happens during the package delivery. There will be 50% refund for the delivery cost.

Ardy: Well, I hope nothing bad happens to the package.

Clerk: What if adding an insurance for the package? You can claim 100% of the delivery cost and the value of the package.

Ardy: How much is the insurance cost?

Clerk: It is 10% of the delivery cost, Rp3,000.

Ardy: All right. Please add an insurance for the package. Here is the money.

Clerk: Thanks. Please keep this receipt for you. You can check the process of our delivery by checking it on our website on the Internet. You only need to input the receipt number.

Ardy: Sure. Thanks.

Clerk: You're welcome. I hope you're satisfied with our service.

What information does Clerk need to measure the delivery cost?