A/b *100
For example,
30/600.
30/600=0.05
0.05*100=5%
1,2,3,5,6,10,15,30 because by looking at the number at the ones place, when it is 0 or an odd number, it could be divided by 2. When the places are added together and when it is divisible by 3, it is the factor of 3. Also, when there are 2 and 3 as a factor, it is also divisible by 6.
The answer is A. Statistics. Hope this helps!
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