Please help answer the follwing questions.

Bolt Upright Inc. (BUI) manufactures massive bolts used in the construction of nuclear submarines. Each bolt sells for $100. Per-unit variable costs are S60 and total fixed costs are $200,000 per month 1. How many bolts must be sold in order to breakeven? 2. What level of revenue is needed to achieve operating income of $100,000? D2L Brightspace Login for Winonu State University 3. How much will profit increase if 80 additional bolts are sold? 4. The demand for BUT's product is inelastic. Consequently, lowering the selling price by 10% will only increase sales volume by 5% (over the current sales volume of 10,000 units). What is the impact on profit from lowering the selling price by 10%