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if anyone scrolled till here; is there any quick method to solve these kind of questions? especially the 2nd Question?!

Thank you in advance!
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The quick way is visualization
This graph is fairly simple with distinctive visualization of reduced fat milk %

We can see that the portion of reduced fat milk is small comparatively in 1980 and also the total bar is highest in 1980
So even without calculation one can choose 1980 as the answer.

Nikkz99
if anyone scrolled till here; is there any quick method to solve these kind of questions? especially the 2nd Question?!

Thank you in advance!
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