The average export of pearls for the given period (in Rs. crores) was ?

Answer: Option B

Average export of pearls over the period
  $$=\left\{\frac{1}{7}\left(5.2+6.5+7.8+9.9+10.8+9.5+11.4\right)\right\}\text{crores}$$
$$\begin{array}{rl}& =\frac{61.1}{7}\text{ crores}\\ & =8.728\text{ crores}\\ & =\text{Rs. }8.73\text{ crores}\end{array}$$