The sales tax is $3.2 and total cost is $ 43.2
Solution:
Given, An item sells for 40$
And sales tax on the item is 8 %
We have to find what is the sales tax and total cost
Now, we know that, sales tax = 8% of selling price

Now, sales tax = $ 3.2, then,
Total final cost = selling price + sales tax
Total cost = 40 + 3.2
Total cost = $ 43.2
Hence, sales tax and total cost are $3.2 and $43.2 respectively.