Which of the following is a sequence are geometric

So there's no attached file or any sequence, but a geometric sequence can be identified by the way that the terms change. The formula for a geometric sequence is tn= t1* r^(n-1)
If the difference between terms is obtained through multiplication, it is a geometric sequence. For example:
2, 10, 50, 250... is a geometric sequence. The change, r, is 5.
However, the sequence 3, 11, 19, 27 is not geometric, it is arithmetic because the change is obtained through subtraction.

M< 5 = 80 , < 2 = 80, < 6= 100, < 3= 100, < 7= 80, < 4= 80, < 8= 100

The answer is 90 % because since 20 multiplied by 5 is 100 you would have to do each question multiplied by 5 so 18 times 5 equals ninety percent.