Consider the above reaction where 6.1 g of benzoic acid is used to get 7.8 g of m -bromo benzoic acid. The percentage yield of the product is $\_\_\_\_$ . (Round off to the Nearest integer) [Given : Atomic masses : $\mathrm{C}=12.0 \mathrm{u}, \mathrm{H}: 1.0 \mathrm{u}$, $\mathrm{O}: 16.0 \mathrm{u}, \mathrm{Br}=80.0 \mathrm{u}]$