:
1. =100, =100/2   ........................ 2 .;
2. =80, =100/2   ....................... 1 .;
3. =50, -100/2    / .......... 2 .;
4. =25 (20-32), =100/2   ............... 25 .
  ,  ,  ,  .  =100  .  
. ,   .