In January 1998, a poultry farmer bought 100 hens at N150.50 each. During the year, she obtained 12,500 eggs which she sold at N125.00 per score. She spent N30,050.00 on feeding and N12,000.00 on drugs for the year. By December 1998, she sold the 80 surviving hens at the rate of N250.00 each. Find her percentage gain or loss.