A man purchases 8 pens for Rs.9 and sells 9 pens for Rs.8, how much profit or loss does he make?
Choose the correct choice from the following
A) 15 B) 66 C) 88 D) 1 E) 12
90 * 10/60= 
<gadget id="calculator">90 * 10/60</gadget>
<output>15</output>
15 kmph   15nswer: 15
<result>A</result>
A man purchases 8 pens for Rs.9 and sells 9 pens for Rs.8, how much profit or loss does he make?