Ana opened a bank account with $1000 that earns interest, compounded continuously, at an annual rate of r=0. 2. Money can be withdrawn from the account at regular intervals, and no additions to the account can be made. The function p models the balance of the account, in dollars, at time t. Assume that ana withdraws money from the account continuously at a rate of n dollars per year. Which of the following differential equations best describes the relationship between p and t ?.