Drupal cms stacked google bar chart - php

Question

I'm having issues generating a stacked bar chart using drupal cms.
I'm making use of this api to generate chart
(https://drupal.org/project/google_chart_tools)
as shown:
> $settings['chart']['chartOne'] = array(
>
'header' => array('Teachers', 'Student'),
'rows' => array(array(20, 100)),
'columns' => array('people'),
'chartType' => 'BarChart',
'containerId' => 'content1',
'options' => array(
'forceIFrame' => FALSE,
'title' => 'School',
'width' => 800,
'height' => 400,
'isstacked' => TRUE
)
how can i make it on the chart such that?
example :
10 out of 20 teachers are male and the other 10 are female
50 out of 100 students are male and the other 50 are female
Tried modifying the following and getting only teachers but empty students:
> $settings['chart']['chartOne'] = array(
>
'header' => array('Teachers', 'Students'),
'rows' => array(array(10),array(10)), array(array(50),array(50)),
'columns' => array('Male', 'Female'),
'chartType' => 'BarChart',
'containerId' => 'content1',
'options' => array(
'forceIFrame' => FALSE,
'title' => 'School',
'width' => 800,
'height' => 400,
'isstacked' => TRUE
)
Output Results : http://i.stack.imgur.com/V86qQ.png

Answer 1

Answer from the OP which was originally posted into the question
$settings['chart']['chartOne'] = array(
'header' => array('Teachers', 'Students'),
'rows' => array(array(10,50),array(10,50)),
'columns' => array('Male', 'Female'),
'chartType' => 'BarChart',
'containerId' => 'content1',
'options' => array(
'forceIFrame' => FALSE,
'title' => 'School',
'width' => 800,
'height' => 400,
'isstacked' => TRUE
)