The answer is c, 6/9, because 0.75 equals 3/4 in fraction form, and 6/9 reduces to 2/3.
40(7.85) = 314
314 - (32.24 + 24.02 + 24.53) =
314 - 80.79 = 233.21 <== net pay
It is school attended because it does not impact your income and has nothing to do with how trustworthy you are to pay back any kind of loan (which is basically what a credit score is)
Triangle SET is similar to triangle SAR, so corresponding sides have the same ratio. This means
... ST : SR = ET : AR = 8.19 : 6.37
Then ST : TR = 8.19 : (6.37+8.19) = 8.19 : 14.56
Using division symbols, this is
... ST/TR = 8.19/14.56
Multiplying by TR gives
... ST = TR×(8.19/14.56) = 20.8×8.19/14.56
... ST = 11.7