Как изменить у калькулятора зависимый коэффициент в формуле в Tilda

<script>
document.addEventListener("DOMContentLoaded", function() {
(function () { 
    
    const vidInput = document.querySelector('input[name="numoperation"]');
    const corectionInpit = document.querySelector('input[name="correction"]');
    const profitInput = document.querySelector('select[name="profit"]');
    corectionInpit.closest('.t-input-group').classList.add('correction');
    
    function correctionStart(){

        const profitType = profitInput.selectedIndex;
        
        if (  (Number(vidInput.value) >= 30) && profitType ){
            corectionInpit.value = 0.5;
        }else{ 
            corectionInpit.value = 1;
        };
    };
    

    ["input", "keyup"].forEach(function(event) {
	    vidInput.addEventListener(event, function() { 
            if (this.value.match(/[^0-9]/g)) {
                this.value = this.value.replace(/[^0-9]/g, '');
            };
            if( this.value.length > 3) {
                this.value = this.value.substr(0, 3); 
            };
            correctionStart();  
	    });
    });

    vidInput.nextElementSibling.addEventListener('click', function(event) {  
        correctionStart();
    });
    
    vidInput.previousElementSibling.addEventListener('click', function(event) {  
        correctionStart();
    });
    
    profitInput.addEventListener('change', function(event){
        correctionStart()
    });

})();    

});
</script>


<style>
.correction{display:none}
.t700 .t-input-group.t-input-group_fr {
    display: flex;
    align-items: baseline;
}
.t700 input.t-inputquantity {
    height: 40px;
}
</style>