A continuous annuity is a steady stream of money that is paid to some person. Such an annuity may be established, for example, by making an initial deposit in a savings account and then making steady withdrawals to pay the continuous annuity. Suppose that an initial deposit of $5400 is made into a savings account that earns 5/12% interest compounded continuously, and immediately continuous withdrawals are begun at the rate of $300 per year. Set up the differential equation that is satisfied by the amount f (t) of money in the account at time t. Sketch the solution.