Say that the average worker in Argentina has productivity of $10 per hour while the average worker in Brazil has productivity of $12 per hour. If worker productivity, over the next 8 years, grows 1.5%...

Say that the average worker in Argentina has productivity of $10 per hour while the average worker in Brazil has productivity of $12 per hour. If worker productivity, over the next 8 years, grows 1.5% per year in Brazil and 5% in Argentina. At the end of the 8 years, how much more productive are Argentina workers relative to Brazilian, in percentage terms.
what equation do I use ?