MCQ

Arnold is contemplating for purchasing $280000 a machine which he will use to produce 50000 units of a product per annum for 5 years. This product will be sold for $10 each and unit variable cost are expected to be $6. Incremental fixed cost will be $70000 per annum for production cost and $25000 per annum for selling and admin cost. Arnold has a required return of 10% per annum By how many units must be the estimate of production and sales volume fall for the project to be regarded as not worthwhile a)2875 b)7785 c)8115 d)12315 Sir correct ans is B and i have also computed at option B the NPV of project will be 0. However as the question ask for the project not to be worthwhile, in other words it mean rejection of project ,so shouldn't it be at option C or D , as NPV at both of these options would be negative?