According to ques,
Number of articles
And, the total cost of articles
Again,
(i) Cost of one article
(ii) also,
or,
or,
or,
or,
Since the number of articles cannot be negative,
According to ques,
Number of articles
And, the total cost of articles
Again,
(i) Cost of one article
(ii) also,
or,
or,
or,
or,
Since the number of articles cannot be negative,