"How much do they cost?" is the Engpsh equivalent of "它们需要多少钱".
This phrase is commonly used when inquiring about the price of goods or services.
Example:
Can you tell me how much these shoes cost?
How much does this meal cost?
中文翻译:
你能告诉我这双鞋多少钱吗？
这餐饭多少钱？