This looks like an incomplete answer to me...
I cannot see any diagram or window or opening, or any lines that indicate they are line AC or BD.
Answer:
36
Step-by-step explanation:
one calculator price =30/5=6
cost price of 6 calculator=6*6=36
x=12
8x6=48 =x
6x6=36
equation= 6x*6-48=x
the answer is 264000.....