I couldn't complete this without help from Wikipedia, and even then I couldn't figure out what precision to use where to get exactly the same numbers. All my answers were correct except for the final balance being off by a few dollars. Some guidance on precision would've made this a reasonable Kata. As it is, thumbs way down.

I get:

java.lang.ClassCastException: clojure.lang.PersistentVector cannot be cast to java.lang.Number
at clojure.lang.Numbers.lt (Numbers.java:221)

from the test cases now, when the same code used to give me two passing cases and one legitimate failure

I'm using Clojure