$48$ men can do a work in $14$ days. Find the amount of work done by $5$ men in $12$ days.

Let's compute the total work in terms of man-days:
$$\text{Total Work}=48\times 14=672\text{ man-days}$$

Now, compute the work done by $5$ men in $12$ days:

$$\text{Work Done}=5\times 12=60\text{ man-days}$$

The percentage of the total work completed is:

$$\text{Percentage of Work Done}=\left(\frac{\text{Work Done}}{\text{Total Work}}\right)\times 100\%$$

$$\text{Percentage of Work Done}=\left(\frac{60}{672}\right)\times 100\%=\frac{6000}{672}\%\approx 8.93\%$$

Rounding to one decimal place gives $8.9\%$.