Wordpress calculator integrated with a site

A stylable wordpress plugin that can calculate the cost of a window, based on parameters selected by the user. The plugins parameters and values must be editable, and the ability to add additional options and associated values via wp-admin must be there. The final cost and configuration must then be displayed with and without VAT, and payed for online. Calculations: (Outer glass + spacer bar width + spacer bar colour + inner glass + lead or georgian) * area = initial cost When Toughened is selected, an additional cost must be added, depending on which outer glass and inner glass options are selected. These values must be editable, and linked to the associated option. The toughend option, must also be automatically added in the total are exceeds a user defined parameter. Stepped unit must increase the price by a percentage of the base rate only (base rate = outer glass + inner glass * area)…. No step = no additional cost. Option one = +20%. Option 2 = +50% etc. Shaped unit is the same as Stepped….. circular shaped = + 50% etc Submitted functionallity: Once the add to basket button is complete, a summary must be generated with prices with and without VAT, and a quantity can be specified. The user should be able to use the form multiple times, and multiple products added to a checkout It must then be implemented into a wordpress (divi) site and styled