Depositing either cash or a surety bond approved by the commissioner in its improvement care trust fund, in an amount to be determined according to the population of the county in which the cemetery is located, as estimated by the 1960 federal census or any subsequent federal census, as follows: 10,000 or under $ 40,000
10,001 to 15,000 60,000
15,001 to 20,000 80,000
20,001 to 100,000 100,000
100,001 or more 200,000.