function calc_wmc() {
	var percent = 0;
	var credit_sum = document.getElementById('credit_sum').value*1;
	var srok = document.getElementById('srok').value;

	var KR = credit_sum * srok;	

	//document.getElementById('wmc').value = credit_sum.options[credit_sum.selectedIndex].value + " / " + srok.options[srok.selectedIndex].value;

	if(KR<500) { percent = 1.3; }
	if((KR>=500) && (KR<1000)) { percent = 1.2; }
	if((KR>=1000) && (KR<1500)) { percent = 1.1; }
	if((KR>=1500) && (KR<2000)) { percent = 1; }
	if((KR>=2000) && (KR<2500)) { percent = 0.9; }
	if((KR>=2500) && (KR<3000)) { percent = 0.8; }
	if((KR>=3500) && (KR<4000)) { percent = 0.7; }
	if((KR>=4000) && (KR<4500)) { percent = 0.6; }
	if((KR>=4500)) { percent = 0.5; }	
	
	document.getElementById('wmc').value = Math.round((credit_sum+(credit_sum/100*percent*srok)+((credit_sum+(credit_sum/100*percent*srok))/100*0.1)+((credit_sum/100)*0.8))*100)/100;

}