Expressed as a percentage, 400/1000 x 100 = 40 percent.
It is 2.5*400 = 1000
1000*400=400000
400 + 1000 = 1400
400 percent of 1000 = 4000
0.4
400
1000 + 400 - 300 = 1100
400 + 900 + 1000 = 2300
-4 in percentage = -400%-4 * 100% = -400%
1000 g = 1 kg so 400 g = 400/1000 = 0.4 kg. Simple!
2/5 x 1000 = 400