|-------|-------|-------|------| PRIMA ZI
1/4
|----|-----|-----|-----| a 2 a zi
1/4
|-----|-----|-----| a 3a zi
1/3 +72
a treia zi 72:2x3 = 108 lei ( a cheltuit 1/3= 108:3=36)
a doua zi 108:3x4= 144 lei ( a chetuit 1/4= 144:4=36)
prima zi 144:3x4=192 lei ( a cheltuit 1/4= 48 lei)