SOLVE THIS QUESTION USING SENSITIVITY ANALYSIS

The initial outlay for equipment is $100,000.$ It is estimated that this will generate sales of $10,000$ units per annum for $4$ years. The contribution per unit is expected to be $6$ and the fixed costs are expected to be $26,000$ per annum. The cost of capital is $5\%.$

Requirements $($i$)$ Calculate the NPV$.($ii$)$ By how much can each factor change before the entity becomes indifferent to the project.