Hilary's Jewels sells cubic zirconium (fake diamond) rings for $80 each. The projected income statement for 2016 follows: Sales Variable costs S4,000,000- (2.200.000 1,800,000. (1.600.000 S 200.000 Contribution Margin Fixed costs Pre-tax profit Required: aCompute the contribution margin per ring and the number of rings that b. Compute the contribution margin ratio and the breakeven point in total c. Suppose the total revenues were $200,000 greater than expected. What is d. What is the margin of safety in number of rings? must be sold to break even. revenue. the total pre-tax profit?- e. o. How many rings must be sold to earn an after-tax profit of $300,000