Answer :
Step 1:
Given data
Cost of laptop = $1500
Total cost = $1590
Step 2
Find the tax
Tax = $1590 - $1500
Tax = $90
Step 3
Next, find the tax in percentage
[tex]\begin{gathered} \text{Tax rate = }\frac{9}{1500}\text{ }\times\text{ 100\%} \\ =\text{ }\frac{900}{1500} \\ =\text{ 0.6\%} \end{gathered}[/tex]