The percentage of people from north-west zone who take coffee only once a week is approximately.

Answer: Option D

People who take coffee only once a week in there zones
= 620 + 540 + 350
= 1510
∴ Required percent
$$\begin{array}{rl}& =\frac{1510}{11050}\times 100\\ & =13.66\%\\ & \approx 14\%\end{array}$$