A milkman bought 70 liters of milk for Rs. 630 and added 5 liters of water. If he sells it at Rs. 9.00 per liter, his profit percent is :
[A] $8\frac{1}{5}$%
[B] $7$%
[C] $8\frac{2}{5}$%
[D] $7\frac{1}{7}$%