For this case we propose a rule of three:
£ 899 ----------------> 100%
x ----------------------> 20%
Where "x" represents the amount of money corresponding to the VAT.
[tex]x = \frac {20 * 899} {100}\\x = 179.8[/tex]
So, the VAT is £ 179.8
ANswer:
The purchse price of VAT is £ 179.8
