23 600 + 21 500 + 26 400 + 28 500
= (21 500||21500 + 28 500) + (23 600 + 26 400||26400))
= 50 000||50000 + 50 000||50000
= 100 000||100000
23 600 + 21 500 + 26 400 + 28 500
= (21 500||21500 + 28 500) + (23 600 + 26 400||26400))
= 50 000||50000 + 50 000||50000
= 100 000||100000