30% is 0.30 so, 0.30 x 70 = 2100 move the decimal to the left 2 times and get 21 and 21 is your answer!
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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.