if $ 120 invested at a certain rate of simple interest amounts to $ 180 at the end of 3 years, how much will $ 150 amount to at the same rate of interest in 6 years?  Choose one:	A) $ 190	B) $ 180	C) $ 200	D) $ 240	E) $ 300
<gadget id="calculator">150 * 6</gadget>
<output>900</output>

<gadget id="calculator">180 - 120</gadget>
<output>60</output>

<gadget id="calculator">60 * 120</gadget>
<output>7_200</output>

<gadget id="calculator">7_200 / 120</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">900 * 20</gadget>
<output>18_000</output>

<gadget id="calculator">18_000 / 120</gadget>
<output>150</output>

<gadget id="calculator">150 + 150</gadget>
<output>300</output>

<result>E</result>
if $ 120 invested at a certain rate of simple interest amounts to $ 180 at the end of 3 years, how much will $ 150 amount to at the same rate of interest in 6 years?
add(150, divide(multiply(multiply(150, 6), divide(divide(multiply(subtract(180, 120), 120), 120), 3)), 120))
"120 amounts to 180 in 3 years . i . e ( principal + interest ) on 120 in 3 years = 180 120 + 120 * ( r / 100 ) * ( 3 ) = 140 = > r = 50 / 3 150 in 6 years = principal + interest = 300 answer is e ."