Write a function called school$\_$transmission$\_$level that has the percent positivity of diagnostic tests $($postivity$)$ and the number of new case per $100,000$ people $($new$\_$cases$)$ as input. The function should return the transmission level as 'low','moderate','substantial',or 'high'. You should notice that you should use the highest transmission level of the two indicators. For example if one indicator is 'low' and the other is 'moderate', the transmission level is moderate. Hint: Convert each indicator into an integer level $(0,1,2,3),$ then return the max$()$ level.