A farmer has 900 eggs. He placed them on a tray, which holds 30 eggs each. How much will the farmer earn if he sells it for $2.5 per tray?
There are 900 / 30 = 
<gadget id="calculator">900/30</gadget>
<output>30</output>
30 trays that hold 900 eggs.
So, the farmer will earn 30 x $2.5 = $
<gadget id="calculator">30*2.5</gadget>
<output>75</output>
75 if he sells it per tray.

<result>75</result>