Practical

Use the following average annual national electric prices to answer the following $8$ questions. Each year's price is the result of averaging all $12$ months for each year, Jan. to Dec. for $2013,$ Jan. to Dec. for $2014,$ etc. $($Precision counts for this! Make sure you key in the costs carefully $($all $4$ decimal points$)$ and check the hash total $($the total of all $10$ year's costs$))$

$\backslash$table$[[$Year$,\backslash$table$[[$Ave Electric$],[$Cost $$\frac{s}{K}Whr$