1. (Broverman 3rd Ed. Exercise 1.4.8) Smith buys a 182-day US T-bill at a price P182 which corresponds to a quoted annual discount rate for 182-day T-bills of 8%. 91 days later Smith sells the T-bill, at a price of P91 at which time the prevailing quoted annual discount rate on 91-day Tbills is also 8%. To the nearest 1/10 percent, find the actual rate of return (91-day interest rate, i that Smith earned during the time he held the T-bill. 1.7% 1.9% 2.1% 2.3% The correct answer is not given by (A), (B), (C) or (D) (4) /4) (A) (B) (C) (D) (E) (C) Solution: = $95.956 US bills interpret the quoted rate as a discount rate convertible for the period of the bill. P182 = 100 ×(1 - (182/360) × 0.08) P91 = 100 × (1 - (91/360) ×0.08) = $97.978 i(4)/4 =P91/ P182 -1 = 97.978/95.956 -1= 2.107% = 2.1% 1. $1,605 $1,625 $1,645 $1,665 The correct answer is not given by (A), (B), (C) or (D) (Broverman 3rd Ed. Exercise 1.5.2) Tawny makes a deposit into a bank account which credits interest at a nominal rate of 8% per annum, convertible semiannually. At the same time, Fabio deposits 1000 into a different bank account, which is credited with simple interest at rate h. At the end of five years, the force of interest on the two accounts are equal, and Fabio’s account has accumulated to Z. Determine Z to the nearest $5. (A) (B) (C) (D) (E) (C) Solution: Tawny: eδ = (1 + 0.08/2)2 Hence δ = 0.0784414 Hence h = 0.12906 Fabio: A(t) = 1000 ×(1+ ht) 0.0784414 = δ =(1/A(t)) × dA(t)/dt = (1/(1+5h) × h (1+5h)× 0.0784414 = h Z= 1000 × (1+ 5 ×0.12906) = $1645.30 Less than $305 $305 but less than $315 $315 but less than $325 $325 but less than $335 $335 or more Susan borrows $30,000 on January 1, 2006 at a rate of 5% per annum effective, repayable in 60 equal monthly payments, the first being on February 1, 2006. On August 1, 2008 she makes, in addition to the usual monthly payment, an extra payment of $9,000 after getting a cash bonus at work. The bank agrees that the monthly payments beginning with that on September 1, 2008 should be reduced by an amount R so that the loan is paid off on the same date as originally agreed. Calculate the reduction R in the monthly payment. (A) (B) (C) (D) (E) (D): Solution Can save time by noting that the value of the reduction R equals $9,000 August 1, 2008 payment was the 31st, so there’s 29 left. 9,000 = R a 29⎤ (at 1.051/12 -1 = 0.4074% per month) = R × 27.3000 Hence R = $329.67
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