You can read posting Sarin and his coin bank on the story of coin bank.
Read also posting on Sarin and the million numbers to understand concept of dollars and cents.
Lower primary school mathematics question LPQ32
Sarin and Hairu counting the money they have in their coin banks. If Sarin has $80 more than Hairu. How much money must Sarin give to Hairu so that he will have $14 more than Hairu?
Since the money that Sarin and Hairu is different of $80, we can draw a model base on the amount,
From the above model,
2 units = 80 – 14 = 66
1 unit = $33
Sarin needs to give Harin 33 + 14 = $47
A simple check,
Sarin left with 80 – 47 = $33
Hairu has 47 – 33 = $14 more than Sarin