Instruction 4-5 in a Meat Packaging Plant,Machine a Accounts for 60% of 60

Instruction 4-5
In a meat packaging plant,Machine A accounts for 60% of the plant's output,while Machine B accounts for 40% of the plant's output.In total,4% of the packages are improperly sealed.Also,3% of the packages are from Machine A and are improperly sealed.
-Referring to Instruction 4-5,if a package selected at random came from Machine B,the probability that it is improperly sealed is ________.