Julie filed a valid extension for her 2014 tax return, giving her until October 15, 2015 to

Question:

Julie filed a valid extension for her 2014 tax return, giving her until October 15, 2015 to file her return. She filed her return on November 1 and paid $ 2,000 of tax due. For what period of time will Julie be subject to interest? For what period of time will Julie be subject to the failure-to-file and failure-to-pay penalties?