Igorsrt,
<select id="persons">
<option value="0">50-100</option>
<option value="1">100-200</option>
</select>
<select id="person">
<option value="0">man</option>
<option value="1">woman</option>
</select>
<span id="price"></span>
<script>
var persons = document.getElementById('persons'),
person = document.getElementById('person'),
price = document.getElementById('price'),
prices = [
[2000, 2500], // 50-100
[1900, 2400], // 100-200
];
persons.onchange = person.onchange = function() {
price.innerHTML = prices[persons.value][person.value];
};
persons.onchange();
</script>
