An item sells for 40$ tha sales tax on the item is 8 % what is the sales tax an total cost

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.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)