Answer:
a) £960
b) £576
Explanation:
Hi!
Ok so since the store has a 20% sale we multiply 0.2 to the original amount it would have costed without the sale:
a)

Then we subtract the number we got from the price:
1200 - 240 = 960
Now we do the same thing but this time add since we are trying to find the price of the table before the sale:
b)

480 + 96 = 576
Please ask me if you have any more questions!
and Have a great day! :)