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D. Analyze and solve the problem below.
Kristelneeds to buy notebooks for her outreach program. She went to a bargain market
to look for the best deal she can get. She found out that Aling Zeny's store gives the
best deal. Aling Zeny, the owner of the store, gave the following quotation:
i. If she buys at most 20 notebooks, each notebook would cost P20 each.
ii. If she buys 21-50 notebooks, each notebook would cost P18 each,
iii. If she buys at least 51 notebooks, each notebook would cost P15 each.
1. Write a function relating the total cost C(n) and the number of notebooks n
bought. (2 points)
Solution and answer: