Determine the taxable amount of social security benefits for the following situations. If required, round your answers to the nearest dollar. If an amount is zero, enter "0".

a. Erwin and Eleanor are married and file a joint tax return. They have adjusted gross income of $42,000, no tax-exempt interest, and $14,700 of Social Security benefits. As a result, $ _______ of the Social Security benefits are taxable.

I have tried 7350 and 8675, none is correct, please help! :)