If the cost per catty of cold salad is 10 yuan, then its selling price can be about 17 yuan. A cold dish sells for 10 yuan, and the cost of a cold dish is 2 yuan money. 50 times 10 equals 500 yuan's gross profit, 50 times 2 equals 100 yuan, and 500 yuan's gross profit minus 100 yuan equals 400 yuan's day times 30 days and months equals 12000 yuan.