一部手机进价是 2500 元，加价两成售出，则售价是( )元，五一活动促销九折优惠，优惠后便宜( )元
解：2500×（1+20%）
＝2500×120% ＝3000（元）
3000×（1﹣90%）
＝3000×10% ＝300（元）
答：售价是 3000 元，五一活动促销九折优惠，优惠后便宜 300 元。
故答案为：3000，300。
2018年12月，张阿姨把4000元的存入银行，定期三年，年利率是2.75%到期后，应得利息______元.
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