If a $50 dorm chair is on sale for 30% off, how much is the new cost of the chair?
You can quickly find the answer by finding 10% of $50 and multiplying it by 3. 50/10 = 5, or 10% of $50. 5 * 3 is 15, therefore $15 is %30 of $50. If you subtract the discount from the initial cost of the chair, the new cost of the chair is $35.
In 4/4 time, how many beats does a quarter note get?
1; in the time signature, the top number represents how many beats are in a measure, and the bottom number represents which note gets the beat. Because the bottom number is a 4, the quarter note gets the beat.
What is the difference between an interface and an abstract class, and in what situation would you use each?
An interface can not have implementations, while an abstract class has instance methods and can be implemented. Interfaces can only have final variables, while abstract classes can have static or final variables.