Just out of interest, how much did it cost?
我只是好奇問問，這個花了你多少錢？
How much will it cost, more or less?
這個大概得花多少錢？
The total cost to you is 3 000.
你總共要支付3000英鎊。
How much does it cost to become a member?
要成為會員得花多少錢？
It's time we got on to the question of costs.
我們該討論成本問題了。