4-6 all please

4. You buy goods for $10,000 and receive an invoice with terms 1/10,n/40. What is the maximum simple interest rate that you would borrow money at to take advantage of the discount? (A) 9.13% (B) 9.22% (C) 12.17% (D) 12.29% 5. Alice bought a 91-day $25,000 Canadian treasury bill (T-bill) to yield r=3.5%. She sold the T-bill 40 days later to another investor who wishes to yield r=3.25%. What price did the T-bill sell for? (A) $25,104.15 (B) $25,089.04 (C) $24,886.99 (D) $24.880.37 6. You invest $40,000. It eams simple interest at 7% for the first 3 months, 6% for the next 4 months and 5% for the last 5 months. What is the accumulated value at the end of 12 months? (A) $42,396,63 (B) $42,332.13 (C) 542,378.88 (D) $42,333.33