Need help with Parenteral Dosage Calucations

  1. Hi, I am a Nursing Student and am currently working on my dosage/calculations and I cant seem to understand how to do the following. Any help is greatly apprectiated THANK YOU
    ORDER: Atropine 0.4 mg IM
    SUPPLY: Atropine gr 1/150per mL
    Give: _____mL
    I need a step by step calculation on this Please.