Answer:17.9955
Explanation:
199.95 * 0.09 = 17.9955
when ever you want to work out a % just multiple it by the % in decimal ie 10% = 0.1, 100% = 1.0, 9% =0.09
OR
if you want to work out what 9% is added on top of the price to total 199.95 you can you this
A1= gross amount
B1 = tax percentage
(A1/(100+B1)*100) = 183.440367 before the tax is added so the total tax at 9% = 16.509633