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6. You invest $40,000. It earns simple interest at 7% for the first 3 months, 6% for the next 4 months and 5% for the last 5 months. What is the accumulated value at the end of 12 months? (A) $42,396.63 (B) $42,332.13 (C) $42,378.88 (D) $42,333.33