Need help with both requirements

Required Information (The following information applies to the questions displayed below.) Data for Hermann Corporation are shown below Percent Per Unit of Sales Selling price $ 90 100% Variable expenses 63 70 Contribution margin $ 27 30% Fixed expenses are $30,000 per month and the company is selling 2,000 units per month 2-a Refer to the original data How much will net operating income increase (decrease) per month if the company uses higher quality components that increase the variable expense by $2 per unit and increase unit sales by 10% 2-b. Should the higher quality components be used