How much is the red skirt?
这个红短裙多少钱?
问题补充：He wants (black).打括号部分提问
What colour does he want?他想要什么颜色?1.He wants (black).打括号部分提问2.I want (a sweater).打括号部分提问3.The blue shorts are ￥50.改为一般疑问句和肯定回答4.Can I help you?改为同义句

1. What colour does he want?

2. What do you want?

3. Are the blue shorts ￥50?

   Yes, they are.

4. What can I do for you?