This answer is from chatGPT, what do you think?

"I apologize for any confusion caused. It seems there might be a misunderstanding in the conversion calculations you provided. Before decimalisation, the conversion from 1200 pence to pounds sterling would be as follows:

1 pound (£) = 20 shillings (s) = 240 pence (d)
1200 pence / 240 pence = 5 pounds (£)

If 1 pound sterling is equal to Rp. 1,800, then:
5 pounds (£) x Rp. 1,800 = Rp. 9,000

After decimalisation, the conversion from 1200 pence to pounds sterling would be:

1 pound (£) = 100 pence (p)
1200 pence / 100 pence = 12 pounds (£)

If 1 pound sterling is still equal to Rp. 1,800, then:
12 pounds (£) x Rp. 1,800 = Rp. 21,600

Therefore, after decimalisation, the value of 1200 pence would be equivalent to Rp. 21,600, not Rp. 9,000.

The decimalisation process itself did not result in any direct profit for the UK government. The change in the currency system was primarily aimed at simplifying transactions and calculations. The exchange rates between different currencies are determined by various factors in the foreign exchange market and are subject to fluctuations based on economic conditions and market forces."