An insurance company is offering a new policy to its customers. Typically, the policy is bought by a parent or grandparent for a child at the childs birth. The details of the policy are as follows: The purchaser (say, the parent) makes the following six payments to the insurance company: First birthday: $ 790 Second birthday: $ 790 Third birthday: $ 890 Fourth birthday: $ 890 Fifth birthday: $ 990 Sixth birthday: $ 990 After the childs sixth birthday, no more payments are made. When