这道题是不是把初始成本也扣税了？
问题如下图：
选项：
A. 
B. 
C. 
解释：
Allen is investment manager, who recently recruitea new customer, Curry. Curry investe$2,000 in a Tax-ferreaccount for 20 years. The investment will provi annureturn of 12% before tax. Tax-ferreaccount is expecteto taxe5% the enof the investment perio Calculate the post-tvalue of the investment after 20 years later. $15,066.71 $18,327.96 $24,903.65 B is correct. 考点Types of investment accounts 解析题目中说道Curry的投资是投资在 T的账户，该账户的特点是投资期所得收益不用征税，当投资期结束，投资收益从账户中取出时才进行征税。所以我们运用公式可得 FVIFT=(1+R)N(1−TN)FVIF_{T}={(1+R)}^N(1-T_N)FVIFT=(1+R)N(1−TN) 2000[(1+0.12)20(1−0.05)]=18327.962000{\lbrack{(1+0.12)}^{20}{(1-0.05)}\rbrack}=18327.962000[(1+0.12)20(1−0.05)]=18327.96 T账户是对增值额征税，为什么这道题答案是全额征税？
请问为什么不按照这个公式做，答案不一样
