If a bag of marbles costs $20 and the price increases by 20% of the original price every two months, how much would a bag of marbles cost after 36 months?
When the price of the bag of marble increase by 20%, the price increases by 20/100*20 = $
<gadget id="calculator">20/100*20</gadget>
<output>4</output>
4.
If the price increases after every two months, in 36 months, it will increase 36/2 = 
<gadget id="calculator">36/2</gadget>
<output>18</output>
18 times.
If each increase is $4, the total amount the price of the bag of marbles will have increased by after 36 months is 18*$4 = $
<gadget id="calculator">18*4</gadget>
<output>72</output>
72.
After the total increase of the price of the bag of marbles after 36 months, the total cost will be $20+$72 = $
<gadget id="calculator">20+72</gadget>
<output>92</output>
92.

<result>92</result>