420
840 half-gallons.
84 of 840 would have been 10% 42 is half of that, so 5%
31.5 (get 1/10 of 840, then get 3/4 of that, then get 1/2 of that)
840
840
15 percent of 840 = 12615% of 840= 15% * 840= 0.15 * 840= 126
99% of 840= 99% * 840= 0.99 * 840= 831.6
15 percent of 840 = 12615% of 840= 15% * 840= 0.15 * 840= 126
17.86 percent of 840 = 150.02417.86% of 840= 17.86% * 840= 0.1786 * 840= 150.024
99% of 840= 99% * 840= 0.99 * 840= 831.6
30% of 840 = 30% * 840 = 0.3 * 840 = 252