the mall charges 50 cents for the first hour of parking and $ 3 for each additional hour until the customer reaches 4 hours, after that the parking fee is $ 1 per hour. if a certain customer parked his in the mall for 7 hours and 30 minutes, how much is he going to pay?	Select.
A) $ 11.5 .
B) $ 12 .
C) $ 13 .
D) $ 14.5
E) $ 15 .
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 + (1/2)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) * 1</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">9 + (7/2)</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) + (1/2)</gadget>
<output>13</output>

<result>C</result>
the mall charges 50 cents for the first hour of parking and $ 3 for each additional hour until the customer reaches 4 hours, after that the parking fee is $ 1 per hour. if a certain customer parked his in the mall for 7 hours and 30 minutes, how much is he going to pay?
add(add(multiply(3, 3), multiply(add(subtract(7, 4), divide(50, const_100)), 1)), divide(50, const_100))
charges for 7 hours = ( first hour @ $ 0.50 ) + ( 3 hours @ $ 3 ) + ( 3.5 hours @ $ 1 ) charges for 7 hours = ( 1 @ $ 0.50 ) + ( 3 hours @ $ 3 ) + ( 3.5 hours @ $ 1 ) charges for 7 hours = ( $ 0.50 ) + ( $ 9 ) + ( $ 3.5 ) charges for 7 hours = ( $ 0.50 ) + ( $ 9 ) + ( $ 3.50 ) charges for 7 hours = $ 13 hence correct answer must be ( c )