多少钱【duōshao qián】

多少钱 asks a price. It goes where the predicate goes, with no verb in front of it.

zhè ge这个shì是duō shǎo多少Qián钱 is possible but heavier; the bare form is what people say.

The units

块 is the yuan, 毛 is a tenth of it, 分 a hundredth. 元, 角 and 分 are the written forms that appear on receipts and price tags.

The last unit drops

三块五 is understood as 三块五毛. The final unit is left off unless it would be ambiguous.

钱 drops too

Once the subject makes it obvious that money is involved, 钱 is often left out: 这本书多少？

Counting a quantity

The price of a unit takes 一 plus the measure word.

Too expensive