Translation:The fruit here is cheap.
Report and wait. If everyone comments what didn't work each question, the sentence discussions will become spam filled and terrible to use for learning.
The fruit here is really cheap. Why was I marked wrong? Your solution contains very which can be used as a synonym for really cheap.
There are multiple ways 的 can be used from a grammatical standpoint. Here is a Youtube video explaining the various use cases: https://www.youtube.com/watch?v=ggPbyZN96ss&list=PLCJerON0SkttFzOFyF2a5ZGiupkwkCMOx&t=29s&index=2