Sum by certain keyword in Google Docs
There is actually a cool function in Google Sheets - SUMIF
[caption id="attachment_122" align="alignnone" width="754"] If you hover color's checkbox - the hint is there.[/caption]
Click on color's checkbox, it opens colorpicker and you can play with colors directily in your browser.
[caption id="attachment_126" align="alignnone" width="804"] You can test colors using Chrome Developers colorpicker[/caption]
If you press SHIFT and click color's checkbox — it changes color format: hex → rgb → hsl.
If you click on any numerical value and use your mouses's scroll — you can change it as you wish, smaller or bigger.