amortizing exercise spelled out

bin/bonds.ipynb

@@ -110,8 +110,8 @@
    ]
   },
   {
-   "cell_type": "markdown",
-   "id": "f871c05e-02e5-48a7-94ad-9d4a8aa517fa",
+   "cell_type": "raw",
+   "id": "ca78ef5f-b510-4046-9e25-b25774acc50f",
    "metadata": {},
    "source": [
     "non-amortizing\n",