Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
George donated half his monthly income to charity and spent $20 from the other half on groceries. If he now has $100 left, how much was his monthly income?

### Response:
George donated half of his monthly income to charity.
He spent $20 from the other half on groceries.
So, he has $100 left.
Therefore, his monthly income is $100 + $20 = $<<100+20=120>>120
#### 120

