40
96 dollars - 30% = 70% of 96 dollars = 96*70/100 = 67.20 dollars.
100 - 30% = 100 x (1 - (30/100)) = 100 x 0.7 = 70
70 minus 64 is 6.
70 minus 24 is 46.
4900, ie 7000 x 70/100
30
-30 - (-24) = -30 + 24 = -6
140 minus 70 is 70.
70 - 1 = 69
170 - 70 = 100
112-70= 42
It is: 870-70 = 800