Dear Creditnet: I was recently approved for a zero interest credit card with a $3,500 credit limit. The zero interest promotion lasts for the first 12 months. I’m looking to put the first $1,000 to great use by either paying off balances on 2 high-interest credit cards totaling $800 with monthly minimum payments of $20, or by paying off the balance on a $1,150 auto loan with monthly payments of $165. I'm not sure which will boost my credit score the most. Can you answer this?