The yield of a chemical reaction is defined as the ratio (expressed as a percentage) of...

The yield of a chemical reaction is defined as the ratio (expressed as a percentage) of usable output to the amount of raw material input. Suppose the yield of a chemical reaction depends on the length of time the process is run and the temperature at which the process is run. The yield can be expressed as follows:

Here x₁ = (Temperature - 125)/10 and x₂ = (Time - 300)/30, where temperature is measured in degrees Fahrenheit, and time is measured in seconds. Use a data table to find the temperature and time settings that maximize the yield of this process.