A mysterious white powder found at a crime scene is analyzed and found to contain 66.9 / -0.5% carbon by mass. One of the investigators hypothesizes that the substance is cocaine, C17H21NO4. What is the percent carbon, by mass, in cocaine?

Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan