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

### Instruction:
Brittany got a 78 on her first test. After her second test, her average rose to an 81. What grade did she get on her second test?

### Response:
 Kwanza, mnoa wastani wake kwa idadi ya mitihani aliyofanya ili kupata jumla ya alama anazohitaji kupata kwenye mitihani yote: 81 alama * 2 = 162 alama
Kisha toa alama alizopata kwenye mtihani wake wa kwanza ili kupata alama alizohitaji kupata kwenye mtihani wake wa pili: 162 alama - 78 alama = <<162-78=84>>84 alama