the FINAL result of my form should be a estimated price for some materials that have price by square meter.

Have radio button with 4 option(paper,plastic,fabric and wood), which one with denpencies to another radio buttons (paper1, paper2, paper3 and paper4 `fieldname10`

, and se same for pastic `fieldname6`

, fabric `fieldname8`

and wood `fieldname11`

). see form

the value that result from the choice of one of these materials is the price per meter square see image

then, two number: length `fieldname9`

and height `fieldname2`

, so i can multiply them to get number of square meters, and multiply that value with the price per meter square(that was selected above)

To calculate this (price for the select material with the required measures) e try 2 different formulas but none works properly:

first

`(fieldname9*fieldname2)*(fieldname10)`

only works if the material select is paper

second:

`(fieldname9*fieldname2)*(fieldname10+fieldname6+fieldname8+fieldname11)`

only works if the "user" selects just a material from one type, if then he changes the type of material and select another material, it will add the current result to the previous.

can anyone help with the formula that i shoud have to get this working?