Current Value of Dated Purchase-and-Sale Cash Flows
This Exam FM sample reference tests Current Value of Dated Purchase-and-Sale Cash Flows. The second couch's value equation gives purchase cost X = 1190.82. Moving the earlier purchase of the first couch forward two months and discounting its later sale produces current net value 216.01, choice A.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
BChoice B uses simple interest to move the past purchase cost to today.
CChoice C discounts the first purchase from two months ago instead of accumulating it to today.
DChoice D assumes both transactions have the same value despite their different purchase and sale dates.
EChoice E omits the current value of the first purchase and compares only the two sale dates.
Original practice · fully worked
Original variant: compare two equipment trades
A dealer pays the same amount X for each of two machines. Machine B is bought today and will be sold for 1,200 nine months from today; its net present value is 150. Machine A was bought three months ago and will be sold for 1,200 six months from today. At a constant annual force of 8%, find Machine A's net value today.
A 130.20
B 150.00
C 153.03
D 172.83
E 192.24
Variant answer in brief
Machine B fixes X at 980.12. Machine A's sale is worth 1152.95 today while its past cost has grown to 999.92, giving net value 153.03, choice C.
Setup
Setup
Recover X from Machine B's present-value equation.
150=1,200e−0.08(9/12)−X
X=980.1174
Model
Model
Discount Machine A's sale from six months ahead.
PVsale,A=1,200e−0.08(6/12)=1,152.9473
Compute
Compute
Accumulate its purchase cost from three months ago to today.
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