wilslm

> Pay off loan plus interest and whats left is profit = 1009.8155 -1004.9629 =4.8526 profit

That's how I did it (which similar to how the book did it), but it is not profitable if you look at the last step. You earned 4.8562 yens, out of 1000 yens, that's a profit of 0.485% in 90 days, or about 1.94% annually, which is less than 2% the Japanese rate!