I did this problem out multiple times. The first time I tried I got a 9.9% increase, then the next 4 times I got a 10.0% increase... The website is telling me that is incorrect but I just do not understand how...

Ch 6 Prework 2 i Saved 3 Heather Hudson makes stuffed teddy bears. Recent information for her business follows: 0.75 points Selling price per bear Total fixed cost per month Variable cost per bear $ 28.50 1,360.00 13.50 She sells 430 bears this month. eBook Suppose sales increase by 10 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%)) Print Increase in profit 10.0 % References