Book Maths Puzzle

The interior angles of a polygon are in A.P. The smallest angle is 114degree
and the common difference is 6 degree. How many sides are there in the polygon?

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Book Other Question
If a man can save Rs.5 more every year than he did the year before and if he saves 25 rupees in the first year after how many years will his savings be more than1000 rupees altogether and what will be the exact sum with him? A man’s wages were reduced by 45%. Again, the reduced wages were increased by 45%. Find the percentage decrease in his original wages