15% of the students in mr. riley's social studies classes watch the local news every night. mr. riley found that 136 of the students do not watch the local news. how many students are in mr. riley's social studies classes?

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?