Answer:
$10,648.64
Step-by-step explanation.
$12,000.00+(424.32+424.32=848.64)=$12,848.64
$12,848.64-(450+1,750=)$2,200=10,648.634
side note. it was an accident when you wrote "she has received$ 424.32 in interest" twice just subtract 424.32 once and you will get the answer.