You are a KPOP fan and want to buy MERCHS items. On your birthday, your parents would buy your MERCHS items with a reasonable price. While making a survey with different store, you’ve found these two offers. Store 1: MERCHS consisting of 3 items for ₱1,200.00, but for the fourth item and more, an additional cost of ₱300.00 per item is added. For store 2: MERCHS consisting of 5 items for ₱1, 500.00, but for the sixth item and more, an additional cost of ₱400.00 per item is added.​