Calculation doesn't seem to work.

Hello

Could you check using our demo site? altoswebsolutions.com/live-demo/wordpress
I did it and it works over there.
Could you send me some examples of wrong calculations?
I saw some part in your formula that can be optimized, ex. 779+350-405-632 => 92

I'll be waiting for your feedback.

Best Regards
Paul
AT920

I am trying to put that calculation on your free version of the plugin
350+($aws_price_calc_2-50)/(260-50)*(632-350)+($aws_price_calc_1-160)/(260-50)*(405-350+($aws_price_calc_2-50)/(260- 50)*(779+350-405-632))

It seems to make a calculation but the final result is not correct.
Is there a syntax error? Do I need to buy the premium plugin to make this work correctly?