Question

一种收录机原价500元,现在每台降价100元。现价是原价的百分之几？降低了百分之几？

选择所给动词的正确形式。 I（ ）（am，is）a boy. You( )(is,are)a girl. We（　　）（are,is)astudents. He( )(like,likes)to swim. I( )(has,have)two apples. We（ ）（can，could）climb mountains. Sam( )(buy,bought)a new watch yesterday. Peter ( )(go,went)San Fransisco last month. My mother（ ）(will,would)visit my grandma. I ( )(am going ,go)to take part in Mary's party tomorrow afternoon.

Answer 1

现价是原价的（500-100）÷500＝400÷500＝80％

降低了1-80％＝20%

Answer 2

现价是原价的(500-100)÷500×100%=80%
降低了100÷500×100%=20%

Answer 3

降价6.9%