On a certain day, the total cost of filling up 20 helium balloons was $900. Two days later, the cost of filling each balloon was increased by $20. How much did Bentley pay to fill 170 balloons if he went to fill them after the price increase?
If the total cost of filling up 20 helium balloons was $900 before the price increase, the cost of filling one balloon was $900/20=$
<gadget id="calculator">900/20</gadget>
<output>45</output>
45.
Two days later, the cost of filling each balloon was increased by $20 to $45+$20=$
<gadget id="calculator">45+20</gadget>
<output>65</output>
65.
If Bentley had 170 balloons that he wanted to fill, after the price increase, Bentley paid 170*$65=$
<gadget id="calculator">170*65</gadget>
<output>11_050</output>
11050 to fill 170 balloons.

<result>11_050</result>