Solution of problem 147 of the collection on general ch
If the total amount of your purchases from the seller Михаил_Перович more than:
- 19653 ₽ the discount is 15%
- 9826 ₽ the discount is 10%
- 4913 ₽ the discount is 7%
- 1965 ₽ the discount is 5%
- 983 ₽ the discount is 3%
- 491 ₽ the discount is 2%
- 98 ₽ the discount is 1%
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147. How to prove the amphoteric character of ZnO, Al2O3, Sn (OH) 2, Cr (OH) 3?