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    "# Lab 5\n",
    "* Calculate NPV (Net Present Value). The rate is a float, and the cash flows and investments are in a list.\n",
    "$$\n",
    "NPV=\\sum_{i=1}^{n} \\frac{CF_{i} }{(1+r)^{i}}-I\n",
    "$$\n",
    "* Create a function called NPV to calculate NPV\n",
    "\n",
    "* create a function to calculate IRR. To calculate IRR you may approximate the following expression:\n",
    "\n",
    "    rate= rate*(1-NPV(CFList, rate)/invest). \n",
    "\n",
    "    Remember that investment is the first cash flow.\n",
    "\n",
    "* Create a function to calculate the payback period\n",
    "* Create a class adding all the properties and methods\n"
   ]
  },
  {
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   "execution_count": null,
   "metadata": {},
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   "source": [
    "\n"
   ]
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   "execution_count": null,
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   "source": [
    "#Supose you have the follwoing cashflow\n",
    "CF=[-1200,222,333,555,666,666]\n",
    "CF0=I"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# create a function called NPV to calculate NPV\n",
    "# sugestion: iterate both by index and value using enumerate function"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#create a function called NPV that returns the NPV value"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#create a function to calculate the payback period"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "# create a class adding all the properties and methods\n",
    "#\n",
    "#   +-------------+\n",
    "#   |   project   |\n",
    "#   |-------------|                 \n",
    "#   | cashflow    |\n",
    "#   | name        |                \n",
    "#   | rate        |                                      \n",
    "#   |-------------|              \n",
    "#   | __init__    |\n",
    "#   | calcNPV     |\n",
    "#   | calcIRR     |\n",
    "#   | seeCahsflow |\n",
    "#   +-------------+\n",
    "#"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
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