4. The state owns 16,500 acres of state forest land in a county. Forest and untilled open areas (the kind of land largely within the boundaries of the state forest) are valued at $180 per acre on average when in private ownership. Assessed value is one-third of that value. The forestarea is in two townships of the county . Sixty percent is in a township with a tax rate of $1.80 per $100, and the remainder is in a township with a rate of $1.64 per $100. According to the aid formula for compensating local governments containing substantial amounts of untaxed state property, the county receives in-lieu-o f- property-tax payments of $18,000 per