Agency A had a 30% increase in overhead expenses between the 1st and 2nd quarters of last year. In the 3rd quarter, overhead expenses further increased by 150% over the previous quarter. Due to some cost reductions across the agency, by 4th quarter, the overhead expenses equaled 1/3 of the difference between the expense costs for the 2nd and 3rd quarters.Based on the information provided above, what is the percentage reduction between the 3rd and 4th quarters?