What is the recommended stock of coal? How much will the customer pay for the printer?

M: Jane. shall we go through the inventory then? Let’s start with coal.
F: We have about 45 tons. But we are supposed to have 70 tons.
M: So we’ve got too little. We’d better order some more. How about gas?
F: I think we have enough stock for that.
M: OK, thank you then.

M: ... and how much is your AE 125 printer?
F: Well, the primer itself is ￡ 350, sir, but if you’re buying the computer with it you get a 10% discount, so that’s ￡315.
M: Mm, that’s a good discount, but I only want the printer.  How much would it be including delivery?
F: For this printer... um... ￡375, sir.
M: Oh ... I think I’ll come and fetch it myself.