F.1 MATHS題 20 marks急!plz help!

1)
Let the cost be $x and selling price be $y

By increasing the selling price of a good by 10%, a seller can make a profit of 32%

[(1+10%)y-x]/x*100%=32%
(1.1y-x)/x=0.32
1.1y-x=0.32x
1.32x=1.1y
y=1.2x...(*)

If he does not increase the selling price,
profit%=(y-x)/x*100%=(1.2x-x)/x*100%=20%

2)
profit%
=[(1+20%)y-x]/x*100%
=(1.2y-x)/x*100%
=(1.2(1.2x)-x)/x*100%
=(1.44x-x)/x*100%
=44%

你可以睇ANSWER