The Advanced Tech Company has a project to design an integrated information data base for a major bank. Data for the project are given in the following table. Indirect project costs amount to $150 per day. The company will incur a $100 per day penalty for each day the project lasts beyond day 15. Activity Normal Time Normal Cost (5) Crash Time Immediate Predecessor(s) (days) (days) 800 Crash Cost (5) 1.200 2.200 900 1.000 600 1.200 1.000 2,000 1300 1,300 1.400 900 900 900 500 a. What is the project's duration if only normal times are used? The project duration is day(s). (Enter your response as an integer)