One ticket to a show costs SR10. Maboutou buys a total of 5 tickets for the show using a coupon that gives her a 15% discount. Mohammed buys 7 tickets, using a coupon that gives a 20% discount. How much more did Mohammed pay than Maboutou?
The front wall of a factory as shown below has to be painted. The area of the entrance shown in grey does not need to be painted. If the cost of painting is SR40 per square m, find the total cost for painting the entire wall.