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

### Instruction:
Karen's students are about to take a standardized test. Karen gets a $500 bonus if their average score is above 75, plus an extra $10 bonus for every additional point the average score increases above 75. So far, Karen has graded 8 tests, and the average is 70. Given that each student can have a maximum score of 150, what combined score do the last two tests need to have for Karen to earn a $600 bonus?

### Response:
 Ili apate bonasi ya $600, Karen anahitaji bonasi ya $500 kwa wastani juu ya 75, pamoja na bonasi ya ziada ya $10 kwa kila alama juu ya 75, jumla ya $500+$10*70= $600.
Ili wastani wa Karen uwe juu ya 75, inahitaji kuwa angalau 75+70=<<75+70=145>>145.
Mitihani miwili iliyobaki inahitaji alama jumla ya 145*2= <<145*2=290>>290 ili Karen apate bonasi ya $600.