A shopkeeper buys goods worth ₹ 5,000 and sells them at a profit of 10%. If the rate of GST is 5%, then bill amount is :

1. ₹ 6000

2. ₹ 525

3. ₹ 5775

4. ₹ 5250

If n^th term of an A.P. is 6n - 15, then its common difference is :

1. 6

2. -6

3. 12

4. -12

If a : b = b : c, then a : c is equal to :

1. b : a

2. b² : a²

3. a² : b²

4. b : c