Customisable Option price percentage for Magento 2

Job ID: 30790629

Budget: £20 – £250 GBP

Magento 2 calculates customisable prices based on the 'base' price. I would like it to re-calculate on the cumulative price as selected from the drop downs because I would like the base price to be zero.

I want option 1 of the customisable prices to have the fixed price and then further two drop downs to re-calculate based on percentages.

Please go to my website; https://website-development-area.com/magento2/tester.html to see what I mean.

The price should be $85.50 if A is selected from the 3 drop down boxes. However at the moment it's $100 because Magento calculates percentages/or fixed based on the initial base price, but I have that set to zero.

I have found an old article about this with a solution but this is for magento 1 and not 2 which might help.

This can be seen at https://stackoverflow.com/questions/5990956/i-want-to-modify-custom-option-percent-functionality/6000803#6000803
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