function fn(w,h) {
var priceArr = [
['0', '10', '20', '30', '40', '50'],
['10', '100', '200', '300', '400', '500'],
['20', '101', '201', '301', '401', '501'],
['30', '102', '202', '302', '402', '502'],
['40', '103', '203', '303', '403', '503'],
['50', '104', '204', '304', '404', '504'],
];
return priceArr[w/10|0][h/10|0]
}
alert(fn(31,29));