In 2004 Colin had a salary of $7200. This was an increase of 20% on his salary in 2002.
Calculate his salary in 2002

1440

Step-by-step explanation:

Good Luck!

(a) $6000

(b) 12.5%  

Step-by-step explanation:  

(a): Let his old salary be X  

7200 = 120% (bc it has an increase of 20%)

  x    = 100% (bc it was the original salary without an increase or decrease)

Cross multiply: X= 720000/120

X=6000

The answer is $6000

(b): Percentage change= {(new value-old value) / old value} * 100

His new salary is 8100, and his old salary is 7200

So: (8100/7200) / 7200 = 0.125 * 100 = 12.5

The answer is 12.5%

Hope this is right

$97520

step-by-step explanation:

add 6% to the value she got from selling the house.