function startCalc(){

  interval = setInterval("calc()",1);

}

function calc(){

  one = document.formsol.tax1.value;

  two = document.formsol.tax2.value; 

  document.formsol.tax3.value = (one * 1) + (two * 1);

}

function utilidad(){

	one = document.formsol.tax3.value;

	two = document.formsol.tax4.value;

	document.formsol.tax5.value = (one * 1) - (two * 1);

}

function utilidadgravable(){

	uno = document.formsol.tax5.value;

	dos = document.formsol.tax6.value;

	tres = document.formsol.tax2.value;

	document.formsol.tax8.value = ((uno * 1) - (dos * 1)) - (tres * 1);

}

function renta(){

	uno = document.formsol.tax8.value;

	dos = 0.3;

	document.formsol.tax9.value = (uno * 1) * (dos * 1);

}

function utilidadneta(){

	uno = document.formsol.tax2.value;

	dos = document.formsol.tax7.value;

	tres = document.formsol.tax9.value;

	cuatro = document.formsol.tax8.value;

	document.formsol.tax10.value = (uno * 1) - (dos * 1) - (tres * 1) + (cuatro * 1);

}

function stopCalc(){

  clearInterval(interval);

}