At a cinema, a particular film can be watched in either normal format or in 3-D format. The price of a 3-D ticket is 50% more than that of a normal ticket. The revenue from 3-D tickets is 10% less than that from normal tickets. Express the number of people who watch the film in 3-D as a percentage of the total number of people who watch the film.

HINT: Let m be the number of people who watch the film in 3-D format. Let n be the number of people who watch the film in normal format. Let the price of a normal ticket be £10. Express n in terms of n.