问题标题:
SSAT数学thepriceofacoldroastbeeflunchis$4.80andthepriceofahotroastbeeflunchis$5.40.Ifbothpricesinclude20percentfortaxandtip,whatisthedifferenceinpricebeforetaxandtip?
问题描述:

SSAT数学

thepriceofacoldroastbeeflunchis$4.80andthepriceofahotroastbeeflunchis$5.40.Ifbothpricesinclude20percentfortaxandtip,whatisthedifferenceinpricebeforetaxandtip?

林其骏回答:
  (5.4-4.8)/(1+20%)=0.5
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