问题标题:
GMAT一道数学题$10,000isdepositedinacertainaccountthatpaysrpercentannualinterestcompoundedannually,theamountD(t),indollars,thatthedepositwillgrowtointyearsisgivenbyD(t)=10,000{1+(r/100)}t.Whatamountwillthedepos
问题描述:
GMAT一道数学题
$10,000isdepositedinacertainaccountthatpaysrpercentannualinterestcompoundedannually,theamountD(t),indollars,thatthedepositwillgrowtointyearsisgivenbyD(t)=10,000{1+(r/100)}t.Whatamountwillthedepositgrowtoin3years?
(1)D(t)=11,000
(2)r=10
A.Statement(1)ALONEissufficient,butstatement(2)aloneisnotsufficient.
B.Statement(2)ALONEissufficient,butstatement(1)aloneisnotsufficient.
C.BOTHstatementsTOGETHERaresufficient,butNEITHERstatementALONEissufficient.
D.EACHstatementALONEissufficient.
E.Statements(1)and(2)TOGETHERareNOTsufficient.
黎达宇回答:
我认为是选B(1)的式子只给了D(t)的值而这个式子无法求得满足该式的r和t的值题目规定只有r的值是定量因为年利率不变不能算出r的话便不能贸然带入题目中给的t=3不能确定值的话便不充足
而(2)已经给定了定量r的值直接便可带入原式r和t的值便可求出题目所需答案即确定值13310
还有你那个t应该是平方吧打错了以上
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