Shirley invested a total of $12,000 in two certificates of deposit. One pays 6% interest, and the other pays 7% interest. Her total interest at the end of one year is $790. How much is invested in the CD that pays 6% interest?

Question

anonymous · Answer

if you put say $x$ as the amount invested at 6% then the amount invested at 7% must be $12 00-x$
then $.06\times x+.07(12000-x)=790$ solve for $x$

anonymous · Answer

probably easier to get rid of the annoying decimals by multiplying both sides by 100 and solve 
$$6x+7(12000-x)=79000$$