6. (10 points) In recent years, online shopping has become a major way of shopping. Aunt Wang runs an online store selling washing machines. She can sell an average of 50 washing machines per month, with each machine costing 1200 yuan. Since the shipping is included in the sale, Aunt Wang also has to pay 20 yuan for shipping per machine. In addition, she has to pay 10,000 yuan per month for the "storefront fee" of the website, and 5000 yuan for repairs each month. What should be the minimum selling price per washing machine to ensure that her monthly profit margin is no less than 20%?
【Solution】Solution: According to the analysis, the average cost per washing machine is: $1200+20+(10000+5000) \div 50=1520$
(yuan);
When the profit margin is $20 \%$, the selling price is: $1520 \times(1+20 \%)=1824$ (yuan).
Therefore, the answer is: 1824.