Like all of the Actex texts that I have seen, "Mathematics of Investment and Credit" is cheaply produced and poorly presented. It covers all of the main areas of financial math: interest rates, annuities, bonds etc, and with worked examples, but even with the examples, I found the material to be poorly explained and often difficult to comprehend. There is a reasonably large number of exercises in this text. However, presumably because Actex also sells a solutions manual to accompany this book, the solutions are only given to selected questions and no working is provided.
This is the textbook that was prescribed when I took Financial Mathematics at university. At the time, I found this book so difficult to follow that I ended up buying a second financial math text, Theory of Interest, and working from that instead. Without that second book, I don't think I would have done nearly as well in that unit.