10 = 2*5
100 = 2^2*5^2
1000 = 2^3*5*3
10 000 = 2^4*5^4
100 000 - 2^5*5^5
1000 000 = 2^6*5^6
Two girls-artist, Sue Jones, rent a room, under the window which is a huge tree. One of the girls was seriously ill, she desperately does not want to fight, come up with myself that as soon as the last autumn leaf fall from the tree outside the window, she dies, and is quietly waiting for death. A sheet of all falls, falls, falls ... It turns out the last leaf has fallen for a long time, as it should have happened, and the neighbor-artist, Berman old, not very talented, but very good, painted the exact same sheet in the picture , cold and died. His first and last masterpiece rescued the girl, because she suddenly went on the mend
1)Пусть цена товара была х рублей, после снижения ее на 20%, новая цена стала (0,8х) рублей. После повышения снова на 20%, получаем: 0,8х + 0,2*0,8х = 0,8х(1+0.2) = 0,96х (рублей) стала цена после повышения на 20%. 0,96 это 96 %. 100% - 96% = 4%
Ответ: товар стал дешевле по отношению к первоначальной цене на 4%.
2) Аналогично можно посчитать и во втором случае:
(1 + 0,3)х - 0,3*1,3х = 1,3х - 0,39х = 0,91х (рублей) цена товара после повышения на 30%, а потом понижения на 30%. Видим, что цена товара стала меньше на 9%. Так как 0,91 это 91%; 100% - 91% = 9%.
Ответ: товар стал дешевле по отношению к первоначальной цене на 9%.
вот так.............................
1 )5car 42мин
2) 4car 42мин