the answer is 42.9 %
30 X 100 = 3000
3000 : 70 = 42.85714286
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30% of 70 = 70*30/100 = 21
30 percent of 70 is 21.
40% + 30% = 70%
If you have 70% of something and 30% of another identical "something" that is equivalent to 50% of the two "somethings".
The 30% taken off is $30. The 70% left on is $70.