Jorge finds that 56% of his 75 classmates like salsa music and 80% of his 60 relatives like salsa music. how many more of jorge’s relatives, as compared to his classmates, like salsa music?

Whatever% of anything is just (whatever/100) * anything.

so 56% of 75 mates like it, how much is 56% of 75?  well is just (56/100) * 75, namely 42.

and 80% of 60 relatives like it as well, how much is 80% of 60?  well, is just (80/100) * 60, namely 48.

how many more?  well, 48 - 42.

B-simple yes/no questions