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Linear Systems (Investment Problems)

  1. 1
    Karin deposited a total of 10,000 dollars in two separate accounts. One account paid 5% interest per annum, and the other paid 8% interest per annum. If the total interest earned after one year was $620, how much was invested at each rate?
  2. 2
    Brad invested 15,000 dollars. Part of the money received 4% interest per annum, and the remaining part received 7% interest per annum. If the total interest earned after one year was $840, how much was invested at each rate?
  3. 3
    Grant invested 9,500 dollars. Part of the money received 3% interest per annum, and the remaining part received 6% interest per annum. If the total interest earned after one year was $420, how much was invested at each rate?
  4. 4
    Matt invested 12,000 dollars. Part of the money received 4.5% interest per annum, and the remaining part received 5.5% interest per annum. If the total interest earned after one year was $610 how much was invested at each rate?
  5. 5
    Alex split 5,000 dollars between two accounts. One account received 3.5% interest per annum, and the remaining part received 6.5% interest per annum. If the total interest earned after one year was $265, how much was invested at each rate
  6. 6
    Hope split 11,000 dollars between two investments. One investment received 6% interest per annum, and the other investment received 5% interest per annum. After one year, the interest earned at 6% was $220 more than the interest earned at 5%. How much was invested at each rate?
  7. 7
    Heather split 7,000 dollars between two investments. One investment received 5.5% interest per annum, and the other investment received 7.5% interest per annum. After one year, the interest earned at 5.5% was $135 less than the interest earned at 7.5%. How much was invested at each rate?
  8. 8
    Emily invested 18,000 dollars in two accounts. One investment received 7.3% interest per annum, and the other investment received 6.4% interest per annum. After one year, the interest earned at 7.3% was $218 more than the interest earned at 6.4%. How much was invested at each rate?

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