Because the last time there was an order in November at a price of Fitting Assay 7310 baht but this time prices have to adjust because exchange rate and higher imports only 2 PCs so higher import costs.
The last time an order Fitting Assay last November at a price of 7310 baht however this price hike is due to higher exchange rate and import of only two pieces, the value rose.
Since the last time of order Fitting Assay last November that price 7310 baht. But this price is rising because exchange rate rise and import only 2 pieces of the input value higher.