a ) At $85 , a firm can sell 4,845 stereo earphones (3.5 mm for android). At this price, elasticity is estimated at 2.3. What is the change in total revenue (+ or -) if the firm drops price by 11%? Round your answer to the nearest dollar.

correct answer is 47430 please show steps

B ) At $184, a firm can sell 18,730 stereo earphones (3.5 mm for android). These are premium earphones, guaranteed for 5 years. At this price, elasticity is estimated at 0.6. What is the change in total revenue (+ or -) if the firm drops price by 9%?

correct answer is -140,818.31 please show steps