Jim decides to go to college to earn some more money.  It takes him 4 years to finish and he gets $50,000 in loans per year.  If he had a 25k a year job before college and his college degree tripled his income, how long would it take to earn the money equivalent to the loans and the money lost from not working while in school.
His salary increased to 25000*3=$
<gadget id="calculator">25000*3</gadget>
<output>75_000</output>
75,000 per year.
So he earns an extra 75,000-25,000=$
<gadget id="calculator">75000-25000</gadget>
<output>50_000</output>
50,000 a year.
His loan cost 50,000*4=$
<gadget id="calculator">50000*4</gadget>
<output>200_000</output>
200,000.
He lost out on 25,000*4=$
<gadget id="calculator">25000*4</gadget>
<output>100_000</output>
100,000 from not working.
So he needs to make 200,000+100,000=$
<gadget id="calculator">200000+100000</gadget>
<output>300_000</output>
300,000.
That means it will take 300,000/50,000=
<gadget id="calculator">300000/50000</gadget>
<output>6</output>
6 years.

<result>4</result>