International Widget Company: Revenues = £9Q and COGS = £10,000 + £6Q, so annual cash flow is CF = 3Q − 10,000 (for years 1–10). Initial investment is £150,000 and salvage value is £100,775 at year 10. With a 4% discount rate, what is the NPV break-even output Q (units per year, approx.)?