I have a reverse calculation problem-
Lets say the price of an item is $10.00 with two taxes @ 10% and 20%.
Now to calculate the inclusive tax amounts - a simple calculation would give you $1 and $2 respectively leaving you with $7.00.
Here's the rub-
If I start with $7 and then apply the taxes I get .7 and 1.4 totaling $9.10
Obviously there is another ratio calculation I'm missing since the correct number to get back to $10.00 are a $7.69 price plus .77 and 1.54 in taxes totaling $10.00
any help is greatly appreciated - thank you in advance