How many 4 digit numbers can you write using only the digits 2 and 5? With each digit having only 2 possibilities, the answer is 2 to the 4th power, which is 16. The 4 is because there are 4 digits. Think about the binary numbers 0000 to 1111, t â¦ here are 2 possibilities for each digit.
The CEN Exam fee is $360...BUT DO NOT PAY THIS AMOUNT!!!! ENA members can get the discounted rate of $220 ($140 savings!). If you're NOT an ENA member, you have the option to join. . All you do is pay your first year's dues (most states it's $100) AND you pay the discounted exam rate like you're already a member!
1 County/engineer fees for a typical perc test might cost $150-$500 while use of a backhoe can add $300-$450 or more, for an average total of $450-$950 for a complete perc test. 2  For example, Guthrie County in Iowa charges $175-$225 in perc test fees, and Caroline County Health Department in Maryland charges $270-$300. If an official perc test is being done to determine what type of septic system to install, check with the local department of health for specific perc test requirements, including whether the test must be performed by a government employee, a private soils engineer or a septic system designer.