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.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: