What is the selling price including VAT, if the VAT amounts to $€3.41$? VAT rate is $8 \%.$ How I calculate the answer?

If the vat rate is $0.08$ then the selling price _without_ vat is given by $$S = 3.41/8 * 100 = 42.625$$

Then the overall price is given by $$P = 42.625 + 3.41 = 46.035$$ which rounded gives $46.04$