John gets his pool cleaned every 3 days.  It cost $150 each time and he gives the guy a 10% tip each time he comes to clean.  Then twice a month he needs to use $200 of chemicals.  How much does his pool cost a month?
He gets his pool cleaned 30/3=
<gadget id="calculator">30/3</gadget>
<output>10</output>
10 times a month.
Each time he gets it cleaned he tips 150*.1=$
<gadget id="calculator">150*.1</gadget>
<output>15</output>
15.
So he pays 150+15=$
<gadget id="calculator">150+15</gadget>
<output>165</output>
165.
So he pays 165*10=$
<gadget id="calculator">165*10</gadget>
<output>1_650</output>
1650 a month on cleaning.
The chemicals cost 200*2=$
<gadget id="calculator">200*2</gadget>
<output>400</output>
400.
So in total, he pays 1650+400=$
<gadget id="calculator">1650+400</gadget>
<output>2_050</output>
2050.

<result>2_050</result>