As to make with that the result (a*b)*(c) =

Necessary to use fracionarios numeros and that they are rounded off in
multiplos of 5.
column column calculates former
0,456 = 0,500
0,530 = 0,550
0,550 = 0,550
0,565 = 0,600

example a5 * b5 * c5 = (0,460*0,565)*(1) = 0,30