Răspuns :
120/ 60= 20 lei (1 procent) 20*100 =200 lei(100 procente)
a - 40/100 *a=120
a - 4a /10=120
10a /10-4a/10=120
6a/10=120
1200=6a /:6
a =200
a - 4a /10=120
10a /10-4a/10=120
6a/10=120
1200=6a /:6
a =200