Burcolene

You are told the 5% growth rate in the first paragraph of the question, and the 4% growth rate in the second paragraph of the question. 'Attrition rate' and 'vesting' are not financial management terms, they are normal English (although not words commonly used :-) ). Attrition rate (or 'churn rate') is the % of people leaving the company. Vesting date is the date on which they get to own the share options.