We can easily create custom options and add price on product price accordingly custom options.
now, i have one challenge how we can apply percentage price on final price.. default magento can apply on product price (base price).
here, Product price = 10, i have created 2 custom options Test and Other.
While we are select Other Option with Value one it will apply on Product price + Test custom options Price (if selected)
If any one know than please let us know