please answer all required question step by step

Salem Industries sells products A, B and C. In 2018 the quantity sold, sales revenue, total variable costs products were: Fixed costs were $4,650,000. Required 1.Compute Salem's breakeven sales (units). Prove your answer. 2.Calculate the sales (in units) required to earn a target profit $1,550,000. Prove your answer. 3.Calculate the reduction needed in the fixed costs to break even at 3,000 units, in case the selling price increased by $50 and the variable cost decreased by 10% for the three products