a.1230
a.1230b.370
a.1230b.370c.600
a.1230b.370c.600d.10000
A) 50x2x12,3= 100x12,3=1 230
B) 25x4x3,7= 100x3,7= 370
C) 12x5x4x2,5= 12x5x10= 60x10=600
D) 500x2x25x0,4= 1000x25x0,4=1000x10=10 000
