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

### Instruction:
Nicky is trading baseball cards with Jill. If Nicky trades two cards worth $8 each for 1 card worth $21, how many dollars of profit does he make?

### Response:
 Kwanza, ongeza gharama ya kadi mbili za $8: $8 + $8 = $<<8+8=16>>16
Kisha toa gharama ya kadi ambazo Nicky ametoa kutoka kwa gharama ya kadi aliyopokea ili kupata faida yake: $21 - $16 = $<<21-16=5>>5