作业求助

linchan

Eight months ago, Louise agreed to pay Thelma $750 and $950, six and twelve
months respectively from the date of the agreement. With each payment, Louise
agreed to pay interest at the rate of 9.5% pa from the date of the agreement. Louise
failed to make the first payment and now wishes to settle her obligations with a
+ g% Z: G$ f" W9 _* `single payment four months from now. What payment should Thelma be willing to
accept if money can earn 7.75%? （最好有过程）

littledognancy

Suppose Intr is annually compounded                                       
& O* Q5 S; M9 U; i+ v) f                Month 0        Mon. 8                  Mon. 12
Cash Principal        X        -750                  -950       
Cash Intr (Should Pay)                -X*9.5%*8/12          -(X-750)*9.5%*4/12               
- E9 P7 J3 }) W3 A# ePV at mon 0        X        -[750+X*9.5%*8/12]          -[950+(X-750)*9.5%*4/12]
7 G" z& n" m6 J                                                 /(1+7.75%*8/12)           /(1+7.75%*12/12)
9 n5 s- X0 R4 |) ~8 A# A6 k- L+ f
+ x4 S, R3 e4 w& M9 J/ ?these 3 should add up to 0, i.e. NPV at month 0 is 0.
                                       
1 f5 G3 f6 m1 W+ C1 e, vConclusion        X        =        1729.8               
                                       
So, Initial borrowing was        1730        *(1+7.5%)        1859.5        approx.         $1,860

littledognancy

Finance 学得不好所以不知道做得对不对。。。看着办吧~ 也许有用。

linchan

对了，答案是$1856.32