请问我理解得对吗？

NO.PZ2015120604000170

问题如下：

A.J. plans to pay his child's tuition fee for four years starting 15 years from now. He estimates the fees is $22,000 per year. If the saving account interest rate is 5.5% annually, and how much payment A.J. should make at the end of each year from now?

选项：

A.

$3,441.23

B.

$3,800.07

C.

$4,009.08

解释：

B is correct.

Step 1: N = 4, FV = 0, I/Y = 5.5, PMT = 22,000, CPT PV = -77,113.30

Step 2: PV =0, N = 14, I/Y = 5.5, FV = 77,113.30, CPT PMT =-$3,800.07

我的理解：Step2中得n=14是因为‘four years starting 15 years from now’的意思是：第十五年开始的时候，就要同时开始上4年的大学。因为本题采用END模式，所以15年的年初等于14年的年末。