You have a total credit card debt of $4000. You receive an offer to transfer this debt to a new card with an introductory APR of 6% for the first 6 months. After that, the rate becomes 24%.

a. What is the monthly interest payment on $4000 during the first 6 months? (Assume you pay nothing toward principal and don't charge any further debts)

b. What is the monthly interest payment on $4000 after the first 6 months? Comment on the change from the teaser rate.