A person's salary has increased from ₹.7,000 to ₹.12,000. What is the percentage increase in his salary ?

A

$$ 61 \frac{1}{7}$$%

B

$$69 \frac{1}{7}$$%

C

$$76 \frac{4}{7}$$%

D

$$71 \frac{3}{7}$$%