Your class mate is correct. Remember when multiplying by a percentage to move the decimal place 2 decimal places to the left. Because 120 and 180 are equal to 300 your classmate is correct in saying that the mark up is 150%
so that means you would divide 300 by 10 and that means she reads 30 pages in 1 hour so if you do 30 divided by 60 or 1 hour you get 0.5 pages so she reads 100 words in 1 minutes
