The total cost of the cheese sandwich is £3.60

The total cost of the jam sandwich is £1.29

The total cost of the scones is £7.17

The total cost of the carrot cake is £3.10

The total cost of the cheese sandwich is £1.94

The total cost of the jam sandwich is 87p

The total cost of the scones is £6.29

The total cost of the carrot cake is £4.69

So the cheapest shop was Tesco