Multiply by float (Double, Decimal)

Hi,

I'm trying to be more specific with a level multiplier, if I multiply a float by a float it just ends up counting to infinity as soon as an event takes place. You can't multiply by double or decimal, cant use an int, so what can I do about it?

Thanks in advance.

(Update: Code as requested)

 private float levMult = 1.4f;
     
     // Use this for initialization
     void Start () {
     
         
 }
     
     void Update () {
         
         // Just a test to see if it works...
         if (Input.GetMouseButtonDown(0)){
             
             currentExperience = currentExperience + 1000;
             }
         
         if (Health == 0){
             
             animation.CrossFade("die");
             Application.LoadLevel(0);
                         }
         
         if (currentExperience >= maxExperience){
         
                 LevelUp();
         }
         
             }
         
     void LevelUp () {
         
         
         maxExperience = maxExperience * levMult;
         Level ++;
         statPoints = 5;
     }
 }