1. **Stating the problem:** Charlie initially bought shares worth 7000. 2. **Part a):** The shares increased in value by 12% after one month. We need to find their worth after this increase. - Initial value = 7000 - Increase = 12% of 7000 = $0.12 \times 7000 = 840$ - New value after one month = $7000 + 840 = 7840$ 3. **Part b):** After two months, the new value decreased by 15%. We need to find their worth after this decrease. - Value after one month = 7840 - Decrease = 15% of 7840 = $0.15 \times 7840 = 1176$ - New value after two months = $7840 - 1176 = 6664$ **Final answers:** - After one month: 7840 - After two months: 6664