Current year of second Taxes shall be current-year taxes to period of five (5) years which shall be added the following per- centage of the difference between the cur- rent-year taxes and the base-year taxes (if greater than current-year taxes) 1st year 80% of difference 2nd year 60% of difference 3rd year 40% of difference 4th year 20% of difference 5th year and thereafter Current year's taxes only
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