245
15%/100% * 230 = 0.15*230 = 34.5
463 + 230 = 693
230 + 360 = 590
-55 + 230 = 175
230 - 155 = 75
It is the same as: 230+50 = 280
You know that the original number (call it 'N') was increased 15%.N plus 15% of N = 2301 N + 0.15 N = 2301.15 N = 230Divide each side by 1.15 :N = 230 / 1.15N = 200
630
115 plus 115 = 230
It equals 285
Approximately 231
180 + 50 = 230