"Simplify" means "make it look nicer but don't change its value". You can't do that to 840.
I could wave my hands in the air, recite all kinds of mathematical formulas and elliptic
integrals, divide the number by 420, and write it as ' 2 '. That would be a lot simpler,
but it couldn't do the same jobs that 840 can do, because it's a different number.
840
15 percent of 840 = 12615% of 840= 15% * 840= 0.15 * 840= 126
99% of 840= 99% * 840= 0.99 * 840= 831.6
17.86 percent of 840 = 150.02417.86% of 840= 17.86% * 840= 0.1786 * 840= 150.024
15 percent of 840 = 12615% of 840= 15% * 840= 0.15 * 840= 126
26% of 840= 26% * 840= 0.26 * 840= 218.4
99% of 840= 99% * 840= 0.99 * 840= 831.6
30% of 840 = 30% * 840 = 0.3 * 840 = 252
25% is a quarter of 840: 840 ÷ 4 = 210
840
840
840% not joking 840 over 100 = 8.4 8.4 x 100 = 840