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The state sales tax on a car of $ 21,900 in South Salt Lake will be $ 1543.95.

We are given that:

The rate of tax on sales for South Salt Lake is = 7.05 %

That is:

Sale tax rate = r = 7.05 %

Now, we are given that the selling price of a car = $ 21,900

Selling price = $ 21,900

Now we need to find the sales tax amount that will be imposed on the car.

For this, we will calculate the percentage.

Sales tax = 7.05 % of $ 21,900

Sales tax = 7.05 % × $ 21,900

Sales tax = 7.05 / 100 × $ 21,900

Sales tax = 7.05 × $ 219

Sales tax = $ 1543.95

Therefore, we get that the state sales tax on a car of $ 21,900 in South Salt Lake will be $ 1543.95.

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