Final answer:
To find the NOI when sales decline to 900 units, adjust the variable costs and contribution margin. The new NOI is -$50,160.
Step-by-step explanation:
To find the NOI when sales decline to 900 units, we need to adjust the variable costs and contribution margin accordingly. Since the original sales volume was 1,000 units, and the variable costs were $52,000, we can calculate the variable costs per unit: $52,000 / 1,000 = $52. Now, we can calculate the new variable costs for 900 units: $52 * 900 = $46,800.
We can also calculate the new contribution margin per unit: $28,000 / 1,000 = $28. Then, we find the new contribution margin for 900 units: $28 * 900 = $25,200.
Now, we can calculate the new NOI. The fixed costs are given as $21,840, so we subtract the new variable costs of $46,800 and the new contribution margin of $25,200 from the fixed costs: $21,840 - $46,800 - $25,200 = -$50,160.
Therefore, the new NOI when sales decline to 900 units would be -$50,160.