Plz help for financial algebra

Answer: $277.91
Step-by-step explanation:
The average of the 2 highest salaried quarters is:
[tex]\dfrac{\$13,500+\$12,775}{2}=\dfrac{\$26,275}{2}=\$3,137.50[/tex]
Divide that by 26 (weeks) to find out her average weekly salary:
[tex]\dfrac{\$3,137.50}{26}=\$505.29[/tex]
Multiply that by 55% (0.55) to calculate her weekly unemployment benefit:
[tex]\$505.29(0.55)=\$277.908[/tex]
Round to the nearest penny --> $277.91