✔ 最佳答案
第一份投資是X, 第二份投資是 (5000 –X)
單利息 = 本金 * 利率 * 期限
10% = 0.1, 12% = 0.12
X * 0.1 * 3 = (5000 – X) * 0.12 * 2.5
X * 0.3 = (5000 – X) * 0.3
0.3 X = 5000*03 – 0.3 X
0.3X + 0.3X = 1500
0.6X = 1500
X = 2500
第二份投資是 5000 –X = 5000 – 2500 = 2500
兩份投資款項分別是 $2500 和 $2500