Enum list in Histogram

[Pengujian_BPMek]

Hello bro,i have difficulties using enum list … the case is i select so many list each selection , then i want to show in histogram ( percent ) , how many list i have selected , but it didn’t work … can you tell me the solution ? Example :

1. i select: banana
2. i select : banana, manggo, grape
3. i select : manggo, grape

I want to show in histogram cart ( percent) how many grape i have selected compare to the total item , but it didn’t work in enum list. Please help me