The equation connects the variables A, x, y, z, P and Q

The following changes are made:
x and y are both increased by 50 %
z is decreased by 20 %
P is doubled and Q remains the same.
What is the resulting percentage change in A?

Answer:

4) A

‘x’ increases by 50% = 1.5x

‘y’ increases by 50% = 1.5y

‘z’decreases by 20% = 0.8z

‘P’ is doubled = 2P

‘Q’ remains the same = Q