If you can figure out the commodity code that will give you a percentage to add on top, then if it is liable for the Anti Dumping Duty you’d need to add that, then the couriers fee for collecting the duty, then VAT. That’s all assuming they fill in the paperwork and declare the value properly.
If you ask Melody she will give you a price with tax included, my recent M600 motor arrived with taxes prepaid and was simply delivered to the door by courier.