I take 10% off a line of products (in my online store) via a php script. The prices of the parts were not the same to start with.
Now I need to add the 10% back across the line of products. If I do that it obviously fails.
$100 - 10% = 90$
$90 + 10% = 99$
99$ is not equal to the original $100 price.
So yeah, is there anything I can do to get back to normal pricing?
Thanks for help.