Problema Google Column Chart

Pessoal tenho o seguinte código:

function drawBasic() {
 $.ajax({
 type: 'POST',
 data: 'ref=drawGraphFinance2&id=' + $('#hidb').val(),
 url: '../../assets/server/client/Builds.php',
 dataType: 'json',
 success: function (data) {
 json_events = data;
 }
 });
 var data = google.visualization.arrayToDataTable([
 ['Element', 'Valor', {role: 'style'}],
 ['Jan', 8.94, '#fea400'],
 ['Fev', 10.49, '#fea400'],
 ['Mar', 19.30, '#fea400'],
 ['Abr', 21.45, '#fea400'],
 ['Mai', 50, '#fea400'],
 ['Jun', 21.45, '#fea400'],
 ['Jul', 21.45, '#fea400'],
 ['Ago', 21.45, '#fea400'],
 ['Set', 21.45, '#fea400'],
 ['Out', 21.45, '#fea400'],
 ['Nov', 21.45, '#fea400'],
 ['Dez', 21.45, '#fea400']
 ]);
 var options = {
 title: 'Gastos/mês',
 hAxis: {
 title: 'Meses'
 },
 vAxis: {
 title: 'Valor (R$)'
 },
 'height': 350,
 'colors': ['#fea400']
 };
 var chart = new google.visualization.ColumnChart(document.getElementById('chart_div_2'));
 chart.draw(data, options);
 }

public function drawGraphFinance2($idBuild) {
 $data = array($idBuild);
 $sql = "SELECT SUM(price) AS totlaPrice, DISTINCT EXTRACT(YEAR_MONTH FROM date) AS data FROM sys_constructions_finance WHERE id_construction = ? GROUP BY date;";
 return parent::selectDB($sql, $data);
}

$responseFinance = $b->drawGraphFinance2($_POST['id']);
 $rows = array();
 foreach ($responseFinance as $dgf2) {
 $temp = array();
 $temp[] = array('v' => (string) $dgf2->data);

 $temp[] = array('v' => (doubleval($dgf2->totalPrice)));
 $rows[] = array('c' => $temp);
 }

 $table['rows'] = $rows;
 echo json_encode($table);

Não estou conseguindo montar o gráfico da maneira correta, alguem pode me ajudar?