Today is December 28. Melody is interested in the things on sale at Sandra's Sports Shop. She has 1,700 NT dollars and she has decided to buy a pair of sports shoes. What else can she buy?

Mr. Chen went to Sandra's Sports Shop two times in December. He bought a bicycle for his son as a birthday present on December 3. On December 17, he went there again to buy a jacket for his daughter. How much did he spend at Sandra's Sports Shop in December?