Note that the table is set around the purchase price (winning more than 30% will stop winning; Downward floating loss 10% stop loss); 30%= 1.3, 10%= 1. 1;

30%= 1.3 corresponds to100%-30% = 70% = 0.70;

10%= 1. 1 corresponding100%-10% = 90% = 0.90;

Win 30% from the purchase price of 10 yuan, that is,10 *1.30 =13 yuan;

From the purchase price 10 yuan to the downward loss 10% stop loss, it is 10 * 0.9 = 9 yuan.