Question 1142344
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I will ask you to revise your post to make it clear what the given information is, and what function it is you are supposed to find.<br>
(1) Presumably the function is a piecewise function for the total cost of the cupcakes, as a function of the number of cupcakes; but you don't make that clear.<br>
(2) Surely you haven't stated the cost of the cupcakes correctly.  php15 for the first 100 cupcakes, and after that the price jumps to php13.50 EACH???!!  If I were buying cupcakes at those rates, I would stop after getting the first 100 for php15.<br>
Re-post your question, stating it clearly and correctly.