Transistor Switching for 0-5V
Your measurements are not correct.
1) 4.3V/1k= 4.3mA but you wrongly measured 7.5mA.
2) 5V/200 ohms= 25mA but you wrongly measured 46.6mA.
The transistor is switching with a normal loss of 150mV but it could be 400mV.