The following question are accompanied by two statements i.e. statement (A) and statement (B). You have to determine which statement (s) is/are sufficient/necessary to answer the question.

Set A contains five consecutive even numbers, and the smallest number in the set is a multiple of 10. Find the second-largest number.
A. Largest number is 1.2 times of the smallest number.
B. The difference between the second smallest and third largest number is 2.

You are given a question and two statements numbered I and II. You have to ensure whether the data in the statements are sufficient to answer the question.
Question: What time did the bus leave today ?
Statements:
I. The bus normally leaves on time.
II. The scheduled departure is at 12 : 30.

Find the selling price of the article (in Rs)
A. The ratio of the marked price to the cost price of the article is 3:2, respectively, and the shopkeeper allowed a 20% discount on the article.
B. The difference between the markup price and profit earned on the article is Rs 75.

What is the principal amount (in Rs) ?
Statement I. The simple interest on the principal amount after 3 years is equal to 30% of the principal.
Statement II. The compound interest on the principal amount for 2 years at an annual interest rate of 10%, compounded annually is Rs 630.