Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
A movie theater company is advertising a deal of a movie ticket, a bucket of popcorn, a drink, and a box of candy for $20. Normally, a movie ticket costs $8, a bucket of popcorn costs three dollars less, a drink costs a dollar more than popcorn, and a candy costs half as much as a drink. How many dollars does the deal save a customer who buys a ticket, popcorn, drink, and candy normally?

### Response:
 ถังป๊อปคอร์นมีราคา 8 - 3 = 5 เหรียญ
เครื่องดื่มมีราคา 5 + 1 = 6 เหรียญ
ลูกอมมีราคา 6 / 2 = 3 เหรียญ
ราคาปกติคือ 8 + 5 + 6 + 3 = 22 เหรียญ
ดังนั้น, ดีลจะทำให้ลูกค้าประหยัดได้ 22 - 20 = 2 เหรียญ