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-40 + 70 = 30
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the sum for 20 + 40 + 70 + 80 = 210
This is -70.
-16 + - 40 = -(16 + 40) = -56
this equals 818
70 x 1.4 ie 98. 40% of 70 is 28. If you add 28 to 70 the answer is 98.