What is the cost of a cup of freshly squeezed watermelon juice?

A catty of watermelon can produce a cup of 400 ml fruit juice, and the cost is about 2, 3 yuan. The practice is as follows:

Material: 5kg watermelon.

Steps:

1. Remove seeds, peel and cut watermelon into pieces.

2. Put the cut watermelon into the cooking machine.

3. Press the start button and stir the watermelon into juice.

4. After stirring in the cooking machine, sieve.

5. After sieving, pour the watermelon juice into the container.