Thank you for contacting the Android team.
The line series will not react much differently when set to clustered mode. There is no logical way to cluster the two lines after all. They can however be set to stack, where every next series will not start counting from zero, but will take the first point of the previous series as zero. The stack100 mode will cause the series to stack and to occupy 100% of the plot area where the values will be converted to percentages.
If you are planning to display financial data I would recommend you to use the financial series available with the chart. You can take a look at the examples or in the documentation - http://docs.telerik.com/devtools/android/controls/chart/series/chart-series-financial
Please let me know if you have any additional questions.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.