In a fraction if the numerator is increased by 20% and the denominator is decreased by 20% we get new fraction $$\frac{3}{7}$$ The sum of the new fraction and the original fraction is

A

$$\frac{2}{7}$$

B

$$\frac{4}{7}$$

C

$$\frac{5}{7}$$

D

$$\frac{6}{7}$$