13. (a) $10,402.59     (b) $1,361.41

14. 3 years

15. $337.75

16. (a) 7.0708%     (b) 7.3045%

17. (a) $1,840.10     (b) $1,840.10× 120- $500×180 = $130,812

18. $15,106.20

19. (a) $123,866.46     (b) $33,866.46

20. (a) $154,203.50     (b) $3,242.47 – 2,000 = $1,242.47

21. $981.42

22. $25,000

23. (a) $50/share     (b) Gain of $20/share

24. (a) $37,500     (b) $9,375 (loss)

 

(source)