At the start of the day there was 129.75 in the till one hour later there is 145.40 how much did the shop take in a hour

At the start of the day, there was £129.75. Later, they made more money, so the £145.50. To find the amount of change, you just need to deduct the number 129.75 from 145.50.

145.50 - 129.75 = 15.75

The shop made £15.75 in one hour.