Answer:
B) 50%
Explanation:
300% is the same as 3. So to find 300% of 7 you do 3 times 7 and get 21.
Now you need to find _% times 42 = 21. Divide 21/42 to get 0.5. This is the same thing as 50%.
Hope it helps and have a nice day! :)
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