<human>:  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?
<bot>: How much does the price increase by? ** When the price of the bag of marble increase by 20%, the price increases by 20/100*20 = $<<20/100*20=4>>4
How many times will the price increase? ** If the price increases after every two months, in 36 months, it will increase 36/2 = <<36/2=18>>18 times.
How much will the price have increased by after 36 months? ** 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 = $<<18*4=72>>72
What will the total cost be after 36 months? ** After the total increase of the price of the bag of marbles after 36 months, the total cost will be $20+$72 = $<<20+72=92>>92
#### 92