How is this not the correct answer? I did (4904-3840) / 3840, is that not the correct way to calculate this?

M6-11 Predicting Effects on Profit LO 6-4] Heather Hudson makes stuffed teddy bears. Recent information for her business follows: Selling price per bear Total fixed cost per month Variable cost per bear S 35.00 1,480.00 21.00 She sells 380 bears this month. Suppose sales increase by 20 percent next month. Calculate the effect that increase will have on her profit. (Round your intermediate calculations to 2 decimal places. Round your final answer to 1 decimal place, (i.e. .123 should be entered as 12.3%)) 27.763 %