Toby goes on holiday to geneva, switzerland. in geneva, toby sees a watch costing 193.75 chf (swiss francs). in manchester, an identical watch costs £143 given that £1 = 1.55 chf a) in which city is the watch cheaper? b) by how much is it cheaper (in £)?!

Firstly, we have to transform CHF to in order to work with the same currency and make the comparisson:

If

Then:

Now we can make the comparisons:

a) In Geneva the watch costs and in Manchester it costs .

According to this:

b) If we want to know by how much is cheaper, we have to substract from the expensive price the value of the cheaper price:

Therefore: