I need all three answers again please help

Answer:
Step-by-step explanation:
3) Sales tax rate = [tex]\frac{42.42}{499}*100[/tex]
= 8.50
= 9%
4) Rate of commission = [tex]\frac{1400}{28000}*100[/tex]
= 5 %
5) Reduction = [tex]\frac{30}{100}*5000[/tex]
=$ 1500
New price = 5000 - 1500
= $ 3500