The flag of Algeria seems to be fairly close to your description. The related link shows the Algerian flag.
The answer depends on which countries flag the question is about. In the case of France, for example, the answer is 0%. For Haiti it is 50%. For the EU it is much more.
The knights of white Kamelia flag has 5 red squares and 4 white squares
It is 26/52, a fraction which can be simplified.
3/24
No, Canada has a flag that is white with a large red maple leaf.
In 1967 the current flag replaced the Red Insign
1/2
Probably a red leaf; it is on Canada's flag.
Red and white are the colours on the Canadian flag.
Red and White.
1/5
1/2
china's flag is red with stars, nepals flag is 2 red triangles
White and red.
Canada
Since Red and White are Canada's national colours.