A shopkeeper sells a total of 70 kg potatoes, out of which he sells 10 kg potatoes at a loss of 9% due to spoilage, then at what percentage profit should he sell the remaining potatoes so that he makes a profit of \(15\frac{6}{7}\)% on total potatoes.
1
20%
2
8.6%
3
11%
4
9.5%