In GeoGebra, you can use CAS to compute percentages and growth factors.
In CAS, you can calculate percentages directly using the % symbol. If you want to find % of $, write: 600*30%.
A growth factor can be written like this, where is the percentage: .
GeoGebra Instruction 1
CAS under View in Menu. CAS using the commands above and press Enter or click on Numeric Evaluation