Hello, I have uploaded a few screenshoots for clarity. If I, as can be seen on picture # 2, on the standard price, the color selection and he should 30% to calculate that works flawlessly. But as soon as I choose a higher price, he counts wrong. He then adds the difference of standard price. the result on picture 3 is wrong. Actually, the result should be 345.85 in picture # 3, but it's 307.67. How can you adjust that to make it right? Please excuse my bad english. Thank you for your help