A contractor is engaged for 30days on the condition that he receives Rs.25 for each day he works &is fined Rs.7.50 for each day is absent. He gets Rs.490 in all. For how many days was he absent?	Choose the correct answer.
A) 8 B) 10 C) 15 D) 17 E) 19
30 * 25= 
<gadget id="calculator">30 * 25</gadget>
<output>750</output>
750   490   -----------   260   25 + 7.50= 
<gadget id="calculator">25 + 7.50</gadget>
<output>32.5</output>
32.5   260/32.5= 
<gadget id="calculator">260/32.5</gadget>
<output>8</output>
8   8
<result>A</result>
A contractor is engaged for 30days on the condition that he receives Rs.25 for each day he works &is fined Rs.7.50 for each day is absent. He gets Rs.490 in all. For how many days was he absent?