I do not understand your question. Increase as a noun is both countable and incountable.
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the Goods and Services Tax (GST) and Electronic Road Pricing (ERP) increasesThis is a plural countable noun. There have been one or more increases in both the GST and the ERP, so the minimum possible is two increases.
the Goods and Services Tax (GST) increases/increase
Again, this is a countable noun, but either the singular or the pl