I have no clue what youmeanby that! "Times"whatby 20? to give youwhatfigure? If the initial value was 45£ and the tax is 20% of the value, then the actual amount of the tax is 45 time .20 (NOT 20) which is equal to 9£. Then the price, with tax add, would be 45+ 9= 54£. That is also 1.20times45£.

Not very much sense! Sounds to me like you are memorizing formulas (poorly) withoutI want to know how you come about that sum and how I would apply it to other figures for example £45 VAT of 25%.

Hope my explanation makes sense.

Many thanksunderstandingwhat is being done.

What is "25% of 45£? (That is the same as 0.25 times 45£.) What do you get when you add that tax to 45£?