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

### Instruction:
Carl is taking a class where the whole grade is based on four tests that are graded out of 100. He got an 80, a 75 and a 90 on his first three tests. If he wants an 85 average for the class, what is the minimum grade he needs to get on his last test?

### Response:
 Carl ana alama 245 hadi sasa kwa sababu 80 plus 75 plus 90 inafanya <<80+75+90=245>>245.
Anahitaji kupata jumla ya alama 325 kwa sababu 85 mara nne inafanya <<85*4=340>>340.
Anahitaji kupata alama 90 kwenye mtihani wake wa mwisho kwa sababu 340 minus 245 inafanya 95.