self Maths Puzzle

If you were to construct a 5 × 5 checkered square (i.e., a 5 × 5 chess board), how many rectangles would there be in total? You need to include squares too because a square is a special kind of rectangle.

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self Other Question

It was vacation time, and so I decided to visit my cousin's home. What a grand time we had! In the mornings, we both would go for a jog. The evenings were spent on the tennis court. Tiring as these activities were, we could manage only one per day, i.e., either we went for a jog or played tennis each day. There were days when we felt lazy and stayed home all day long.

Now, there were 13 mornings when we did nothing, 17 evenings when we stayed at home, and a total of 14 days when we jogged or played tennis. For how many days did I stay at my cousin's place? The 10" pizza sells for $ 5.99 at my favorite pizza store. The store claims they have a great deal on the large 14" pizza, which is specially priced at $ 9.98. What is the per cent discount the store is offering?