What part of the grid?

This task is about percentages and decimal fractions.
 
10 by 10 grid shaded with two different patterns
 
a)
What percentage of the large square above is shaded like this stripey shaded sqaure ?
 
 
(A) 1%
(B) 5%
(C) 10%
(D) 15%
(E) None of these. The answer is __________.
 
b)
What percentage of the large square is not shaded in any way?
 
 
(A) 70%
(B) 74%
(C) 79%
(D) 83%
(E) None of these. The answer is __________.
 
c)
What decimal fraction of the large square above is shaded like this drak shaded sqaure?
 
 
(A) 0.7
(B) 0.07
(C) 0.007
(D) 7
(E) None of these. The answer is __________.