The sheet Inventory lists a grocery store$$s inventory for two months. Calculate the percent change for

each item to two decimal places. If the formula gives an error, put "Initial Stock" in the cell. Note that

when old contains a zero then the formula results in a division by zero.

Your solution must have the important property that when we add new products to the inventory, then

the output will correctly update.

Write a simple specification such as:

INPUT: old, an array of numbers.

new, an array of numbers and

error$\_$text defining a string. old and new have the same number of cells.

OUTPUT: The percent change given by the formula $($new$-$old$)/$old$.$ When this fraction is not defined,

output the string error$\_$text. The formula looks like LAMBDA$($old$,$new,error$\_$text, $...).$ An example for

the actual argument for error$\_$text is "Initial Stock".