Emma has to pay back £1750 after 10 years.
To calculate the total amount Emma has to pay back after 10 years with simple interest, you can use the formula:
![\[ \text{Total Amount} = \text{Principal} + \text{Simple Interest} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/l8izkljnc633uqwg1c375oswb4oqn37eb3.png)
The formula for simple interest is:
![\[ \text{Simple Interest} = \text{Principal} * \text{Rate} * \text{Time} \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/4qiy05mv416e51vfhn9ylwhvhfsfiunus9.png)
Given:
- Principal (P) = £1400
- Rate (r) = 2.5% per annum (or 0.025 as a decimal)
- Time (t) = 10 years
Now, calculate the simple interest:
![\[ \text{Simple Interest} = 1400 * 0.025 * 10 = £350 \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/qd1bwmhor6nkojqtaebze6dmyarpux8xf8.png)
Now, plug this into the total amount formula:
![\[ \text{Total Amount} = 1400 + 350 = £1750 \]](https://img.qammunity.org/2024/formulas/mathematics/high-school/9ypf74dvxsm6g2vdpnevzy2fh6nhdk4dqs.png)
Therefore, Emma has to pay back £1750 after 10 years.