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

### Instruction:
Isabel has some money in her piggy bank. She spent half the amount and bought a toy. She then spent half of the remaining money and bought her brother a book. If she has $51 left, how much money, in dollars, did she have at first?

### Response:
After buying the toy, Isabel has 51*2=<<51*2=102>>102 dollars left.
Isabel has 102*2=<<102*2=204>>204 dollars at first.
#### 204