Sam invested $10,000 and earned 20% interest compounded for 3 years. He then invested more until he had three times as much invested. The next year, he got a 15% return on his investment. How much money does he have now?
After one year, Sam had $10,000 * 1.2 = $
<gadget id="calculator">10000*1.2</gadget>
<output>12_000</output>
12,000.
After two years, he had $12,000 * 1.2 = $
<gadget id="calculator">12000*1.2</gadget>
<output>14_400</output>
14,400.
After the third year, he had $14,400 * 1.2 = $
<gadget id="calculator">14400*1.2</gadget>
<output>17_280</output>
17,280.
He then invested more money until he had 3 * $17,280 = $
<gadget id="calculator">3*17280</gadget>
<output>51_840</output>
51,840.
The first year after that, he had $51,840 * 1.15 = $
<gadget id="calculator">51840*1.15</gadget>
<output>59_616</output>
59,616.

<result>59_616</result>