This OpenCart extension provides an alternative product option price calculation. The standard OpenCart price calculation only adds or subtracts the prices of the chosen product options to the total product price, whereas this extension offers more complex option price calculations using a pre-defined option price formula.
Also, on the frontend product page, whenever the user selects an option the total product price is instantly re-calculated and displayed. This is different from a standard OpenCart where the total product price won't be seen until the user goes to the cart checkout.
admin backend (demo/demo): https://www.mhccorp.com/demo/admin