加工一批零件,合格的100件,不合格的3件,废品率是3%. .
:8=18÷ = %==0.375.
:8==0.25= %=5÷ .
÷15=3: =12/ =0.6= %
=20× =12÷15= %= 折= (填小数)= (填成数)
0.375= : == %.