Pop into a McDonald's in Tokyo's business district on any weekday and you'll find a crowd of salaried workers.

Thanks to discount campaigns, what was once considered the turf of kids and young people has become a restaurant for all ages, making the selling strategy something many of the country's fast food chains have had to adopt -- whether they like it or not.

In February, McDonald's Co. (Japan) Ltd. began offering special 50 percent discounts, slashing prices for ham- and cheeseburgers to 65 yen and 80 yen, respectively, Monday through Friday, with the regular price maintained on weekends.