T-bills are sold at a discount to the face value and the
person buying the T-bill makes a profit equal to the difference between the face value
and the market price.
The discount yield of a T-bill is the
percentage profit that a person buying the T-bill at the present market price would be
able to make at expiration.
In the problem given, the time
to expiry is 153 days. As the face value of the T-bill is $10,000, an investor gets
$10,000 after 153 days. For these problems the year is usually taken to have 360
days.
So the annual discount yield of the T-bill is given
by [(10000 – Price) / 10000]*(360 / 153)
This is given to
us as 1.74% or 0.0174.
So [(10000 – Price) / 10000]*(360 /
153) = 0.0174
=> [(10000 – Price) / 10000] = 0.0174*
(153 / 360)
=> (10000 – Price) = .0174* (153 / 360)*
10000
=> (10000 – Price) =
73.95
=> Price = 10000-
73.95
=> Price =
9926.05
Therefore a T-bill of face value
$10,000 bought at $9926.05, gives a discount yield of 1.74% in 153
days.
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