It is necessary because if you don't have a confirmed opinion with textual evidence to back it up you wont have a good argument.
So you subtract the fractal amounts from the whole with all of his customer being 1 and adding all the fractions 1-(1/8+2/5+3/10)
1-(1/8+4/10+3/10)
1-(1/8+7/10)
1-(5/40+28/40
1-(33/40)
1=40/40
40/40-33/40
7/40 of his customers chose a natural finish
Yes it was religious in nature
For a claim too be effective it must be something effecting another thing, however your using this in an argumentive essay which means you'll need to have a strong opinion about this, lots of knowledge... all informations mut be known.
One HUGE Claim:
Racism & Politics
Pick one of the MANY claims from those too topics and spew your feelings! Ask more questions on my profile, i'll be glad too help!