If1000 * (1+5%) =1000 *1.05 = 1050 yuan, it can be sold at least1050 yuan.

1050/1500 = 0.7 = 30% off.

The purchase price of a commodity is 1000 yuan, and the price is marked at the time of sale 1500 yuan. Later, due to the backlog of goods, the store was prepared to sell at a discount, but if the profit rate was not less than 5%, it could be discounted at most (7).