You plan to put money into a bank account that earns a 9.0% annual percentage rate (APR) with monthly compounding.

You plan to put money into a bank account that earns a 9.0% annual percentage rate (APR) with monthly compounding. You plan to invest $800 at the end of each half‐year, as well as a to‐be‐determined initial amount to‐ day. Under this plan, how much must you invest today to have a total account balance of $30,000 in 7 years?