Answer:

0.3996

Step-by-step explanation:

to get 0.3996 you have to;

step 1; 0.2603+0.1583

              =0.4187

step 2;0.4187-0.8183

              =0.3996

CHECK:

    0.2603

 +   0.3996

     0.1584

__________

0.8183