12. The interest due will be
I = Prt = (1.0565·$12,465.00-1300.00)·0.064·(1/12) = $63.30 . . . . correct
13. The interest due will be
I = Prt = (1.0565·$12,465.00-1500.00)·0.05·(1/12) = $48.62
Then your savings is $63.30 -48.62 = $14.68 . . . . correct
14. The balance is 3489.90/5000.00 ≈ 69.8% of the card's credit limit. We do not know the "acceptable debt ratio percentage", so we cannot answer how much over that ratio this balance might be. (Usually such a debt ratio would be the ratio of total debt to income. Knowing just the credit card debt is insufficient information.)
15. [no question]
1+1+1 is 3. And you have 1/3+1/3+1/3=3/3=1. So you end up with 3+1=4. So yes
Since 2 is a whole number , the 2 would go in front of the decimal , 2.00 like so , and since you have 7 tenths combined with the 2 and the tenths place is just after the decimal, it'd look like this 2.7