If order of matrix A is 2 × 3 and that of matrix B is 3 × 2, then which of the following matrices is a square matrix of order 3 :

1. A × B

2. B × A

3. B × B

4. A × A

The mid-point of the line segment joining the points (1, -6), (3, x) is (2, 6). The value of x is :

1. 1

2. 2

3. 18

4. -18

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