CHALLENGE O At a bookstore, Sylvie pays $13.60 for 4 notebooks and 3 pens whereas Katherine pays $9.90 for 3 notebooks and 2 pens. How much will Raphaelle pay for 2 notebooks and 4 pens? 2. At a department store, they sell 50 ml and 100 ml perfume bottles. Seventy bottles give a total of 5 litres of perfume. If each 50 ml bottle is sold for $45 and each 100 ml bottle is sold for $72, what is the total revenue from the sale of all 70 bottles