I used the exchange rate 33 baht per dollar, and in the RP581002 I use invoice exchange rate 34 baht per dollar.
Therefore, the calculation of the expenses in the first two months are equal to 10000 divided by 33 equal management fee $ 303.03 multiplied by 8%, but in 3 months, I will be calculated with 34 equal to 10000 $ 294.12 multiplied by the management fee 8% when all three invoices, a combined total expense is equal to 972.19 dollars.