Hi guys,
I'm totally useless at maths and my brain is really playing up. Could someone skim through my calculations and see if it all makes sence.

I'm selling a product called a 'KD' which costs my (the retailer) £4.30. The price that it's sold to customers varies.

Sale price | Cost (KD cost and in some cases postage).
£7.00 – (£4.30)= £2.70 for selling 1
£60.00 – (£5.32+[£4.30x5=£21.50]) = (£60.00 – £26.82) = £33.18 for selling 5
£11.00 – £1.60 = £9.40 for selling 1

Profit for selling 7 so far (5+1+1) so far: (2.70+33.18+9.40)= £45.28

£45.28 is profit I made by selling 7KD's ontop of paying back the amount it cost me to buy them?