Ann invested a certain sum of money in a bank that paid simple interest. The amount grew to $240 at the end of 2 years. She waited for another 3 years and got a final amount of $300. What was the principal amount that she invested at the beginning?  Choices:
A) $150	B) $175	C) $200	D) $210	E) $220
Amount at end of 2 years = 240$   Amount at end of 5 years = 300$   Difference in amount for time period of 3 years = 60$   Annual Interest earned = 60/3= 
<gadget id="calculator">60/3</gadget>
<output>20</output>
20$   Principal amount invested at the beginning= 240 - 2*20= 
<gadget id="calculator">240 - 2*20</gadget>
<output>200</output>
200$   Answer $200
<result>C</result>
Ann invested a certain sum of money in a bank that paid simple interest. The amount grew to $240 at the end of 2 years. She waited for another 3 years and got a final amount of $300. What was the principal amount that she invested at the beginning?