She is a paid commission of 7.89% of her first 1100
Since the sales are over 1100, she will get 7.89% of 1100
1100* 7.89%
1100*.0789
86.79
How much over 1100 are the sales
1928.25-1100 = 828.25
This amount gets a commission at 15%
828.25 * 15%
828.25 * .15
124.2375
Add these amounts together
86.79 + 124.2375
211.0275
Rounding to the nearest cent
211.03