The options seem a bit mis-formatted but here is the way p is computed:
the decrease is 2000-1600
and it is relative to: 2000 (2003 attendance)
so 
and so that aligns with your Option A. Options B, C, D look incorrect for sure.
Answer:
.875
Step-by-step explanation:
7 divided by 8 is .875.
Answer:
13
Step-by-step explanation:
HCF = Product of two numbers ÷ LCM of these numbers
HCF = 
= 13
I believe it's 37CM, I had that question on my finals last year.