The percentage change in the expenditure on house rent in the two months of January and February was

A

increase of $$2 \frac {6}{7} \% $$

B

decrease of $$2 \frac {6}{7}\% $$

C

increase of $$2 \frac {1}{7} \% $$

D

decrease of $$2 \frac {1}{7} \% $$