A woman earns R356,400 annually. Calculate her income tax if the tax rate is 30%. Then, determine her net salary after tax. Lastly, if she pays 30% tax, what percentage of her salary remains?

$$\text{Income tax} = 30\% \times R356\,400 = \frac{30}{100} \times R356\,400 = R106\,920$$

The amount of income tax she will be paying is $\boxed{\text{R106 920}}$.

4.3.3. Calculate how much of her salary she will receive after tax.

$$\text{Salary after tax} = R356\,400 - R106\,920 = R249\,480$$

She will receive $\boxed{\text{R249 480}}$ after tax.

4.3.4. If she is paying 30% of her income as income tax what % of her salary is left over?

$$\text{Percentage left over} = 100\% - 30\% = 70\%$$

$\boxed{\text{70\%}}$ of her salary is left over.