13. The width of a rectangle is 4.8 cm., which is 30% of the length. Find the perimeter and the area of the rectangle.

14. A coat cost 4000 kroons. At the first revaluation the price was lowered 8%, at the second revaluation yet another 10%. How much was the coat after the second revaluation?

15.The bank pays a depositor 2% a year. How much interest does the depositor get, when the deposited sum is 500 kroons, 1500 kroons, 15000 kroons?

16*. The price of a book was 140 kroons. The book was put on sale with 15% higher price, but after a while the price had to be lowered 20%. What is the price of the book now and how many percent is it lower than the original price?