No. of micro-organisms killed x 100 / No. of micro-organism present initially No. of pathogens killed x 100 / No. of pathogens present initially No. of micro-organisms killed x 100 / No. of pathogens present initially No. of pathogens killed x 100 / No. of micro-organisms present initially
Answer Discuss in Comment
"Scientists dream about doing great things. Engineers do them."
