Ques in the last exrcise about delay and cost

why here we toke th cost of DP(n/2) O(n) AND WHY the delay o(logn) ,shortly how can I know the cost and delay for the DP

Hey, this question was covered in the last recitation, which was recorded and uploaded to the moodle. please refer to this recording for further explanations on this questions. If there are still questions after watching it please write again.