based on value tick yes/no button nintex form

@RonitSSS You could use the following to get you started: 

txt field Client ID JavaScript variable name jsvar_txt 

Checkbox field Client ID JavaScript variable name jsvar_AA

NWF$("#"+jsvar_txt).change(function(){
var moveTO = NWF$("#"+jsvar_txt).val();
switch(moveTO){
case '35000': NWF$("#"+jsvar_AA).prop('checked',true)}
});

@RonitSSS  Add the code to the Form Settings  Custom Javascript section.

I changed the code to include greater than or equal to 35000.

NWF$("#"+jsvar_txt).change(function(){var moveTO = NWF$("#"+jsvar_txt).val();switch(true){case (moveTO >= 35000): NWF$("#"+jsvar_AA).prop('checked',true)}});