Correction in code

Hello Forum
Hello every one
Please if you can help me to solve this problem
In my UserForm i have ComboBox1 and ComboBox2 and TextBox1
ComboBox1 is powered by "JUNIOR" and "SENIOR"
ComboBox2 is powerd by numbers ( 0-1-2-3-4-5 )
I have 3 different cases :
1 - If ComboBox1 = "JUNIOR" the value in TextBox1 will always without seeing ComboBox2 = ("00.00")
2 - If ComboBox1 = "SENIOR" and ComboBox2 = 0 the value in TextBox1 = ("100.00")
3 - If ComboBox1 = "SENIOR" and ComboBox2 > 0 (12345) the value in TextBox1 = ("400.00")
when I make the choice in ComboBox 1 and I choose a number in ComboBox2 .. and always i change by ComboBox2 this code in my UserForm work perfectly
My Problem is :
For example I'm with the first case .. ComboBox1 "JUNIOR" and the number 3 in ComboBox2 ans value ("00.00") in TextBox1 ..Now at this moment suddenly
if i change the choise in ComboBox1 to "SENIOR" ..the value in TextBox1 does not automatically change to ("400")
I want the value in text automatically changes wherever I type
Thank you in advance for help me
Cordially
MARTI MARTI
USERFORM.xlsm

Hiii JBeaucaire
Thank you very very much for your help
Thank you very very much for your best code
That's exactly what I want to have
Thank you
Sincerely
MARTI MARTI