If x dollars are invested at 12 percent for one year and y dollars are invested at 8 percent for one year, the annual income from the 8 percent investment will exceed the annual income from the 12 percent investment by $64. If $5,000 is the total amount invested between x and y, how much is invested at 12 percent?

A、
$1, 680
B、
$1, 997
C、
$3, 003
D、
$3, 320
E、
$3, 500

【正确答案】 A

【答案解析】

根据题意列出等式0.08y= 0.12x+64，y+x=5,000，故x=1680，所以选A项。