A process for producing the mosquito repellant Deet has an initial investment of $$150,000$ with annual costs of $$40,000.$ Income is expected to be $$90,000$ per year.

What is the payback period at $i=0\%$ per year? At $i=12\%$ per year? $($Note: Round your answers to two decimal places.$)$

The payback period at $i=0\%$ is determined to be years.

The payback period at $i=12\%$ is determined to be years.