Answer: £2.20
Step-by-step explanation
Step 1) Add up the values
3.50+2.00+0.50+2.80 = 8.80
Step 2) Divide the previous result over 4 (which is the number of values).
8.80/4 = 2.20
Here is the calculation done in one line
(3.50+2.00+0.50+2.80)/4 = 2.20