A custodian has to clean a school with 80 classrooms. They have 5 days to get it done. It takes them 15 minutes per classroom. If they work an 8 hour day, what percentage of their day, on average, is spent cleaning classrooms?
They have to clean 16 classrooms a day because 80 / 5 = 
<gadget id="calculator">80/5</gadget>
<output>16</output>
16.
They spend 240 minutes cleaning per day because 16 x 15 = 
<gadget id="calculator">16*15</gadget>
<output>240</output>
240.
They spend 4 hours a day because 240 / 60 = 
<gadget id="calculator">240/60</gadget>
<output>4</output>
4.
They spend half their day cleaning classrooms because 4 / 8 = 
<gadget id="calculator">4/8</gadget>
<output>1/2 = around 0.5</output>
.5.
They spend 50% of their day cleaning classrooms because .5 x 100 = 
<gadget id="calculator">.5*100</gadget>
<output>50</output>
50.

<result>50</result>