A quadrilateral PQRS is drawn on a coordinate axes. The coordinates of each of the vertices are as follows: 

P(3, 8) 

Q(2, 4) 

R(7, 2) 

S(7, 6) 

The shape is then enlarged by a scale factor of 2 and mapped on to P’Q’R’S’. The coordinates of the vertices of P’Q’R’S’ are written as follows: 

P’(5, 14) 

Q’(3, 6) 

R’(12, 2) 

S’(13, 10)

a. One of the coordinates of the vertices of P’Q’R’S’ is incorrect. Which one? Justify your answer. 

b. Write down the correct coordinate of this vertex.