Stella runs an electrical goods shop. she has this information about prices of a smart tv at some local shops. shop a =£499 shop b=£420 shop c=£439.99 shop d=£479.99 stella sets her price for the tv at 80% of the average price of the other shops. what price should stella set for this tv? show your working clearly

First, we need to find the average of the smart TV price. 

To do this, first add A,B, C and D together. 

499 + 420 + 439.99 + 479.99 = 1838.98.

Because this is from 4 shops, we need to divide it by 4 to give the average price. 

1838.98/4=459.745

Now that we have the average, we need to find out what 80% of it would be to see what Stella would set the price as. 

459.745/100 (note: perCENT. How many years in a century? That's how you remember what to divide it by)

=4.59745

This needs to be multiplied by 80 (the answer asks for 80%) to give the answer.

4.59745x80=367.796 (remember to add the pounds unit, sorry don't know where it is on my keyboard)

hopefully this helps, let me know if you are still unsure of anything :)