It costs $4 for the first 1/4 hour to use the laundry machine at the Laundromat. After the first ¼ hour it costs $10 per hour. If a certain customer uses the laundry machine for 2 hours, how much will it cost him?
Select:  A) $20.  B) $22.  C) $24.  D) $26.  E) $28.
2 hrs = 120 min   First 15 min ------&gt; $4   Time left is 120 min...   Now, 60 min costs $ 10   1 min costs $ 10/60   120 min costs $  10/60*120= 
<gadget id="calculator"> 10/60*120</gadget>
<output>20</output>
&gt; $ 20.00   So, Total cost will be $20 + $4 =&gt; $ 24   Hence answer will be $24.20 +  4= 
<gadget id="calculator">20 +  4</gadget>
<output>24</output>
&gt; $ 24   Hence answer will be $24.
<result>C</result>
It costs $4 for the first 1/4 hour to use the laundry machine at the Laundromat. After the first ¼ hour it costs $10 per hour. If a certain customer uses the laundry machine for 2 hours, how much will it cost him?