> Sorry, I don't care about the figure after decimal point , but the
> major problem is the integer part -230930 and 4984.
>
> 1. The correct result should be positive but the first result is
> netagive.
>
> 2. -230930 is an error result

Simple mathematics:

(13060.45*9.031631) = 117957.16509395
(13060.45*8.65) = 112972.8925

0 - 117957.16509395 - 112972.8925 = -230930.05759395
0 + 117957.16509395 - 112972.8925 = 4984.27259395

The results of your calculations are approximately correct.

Set