Solution of problem 409 of the collection on general ch
If the total amount of your purchases from the seller Михаил_Перович more than:
- 20483 ₽ the discount is 15%
- 10241 ₽ the discount is 10%
- 5121 ₽ the discount is 7%
- 2048 ₽ the discount is 5%
- 1024 ₽ the discount is 3%
- 512 ₽ the discount is 2%
- 102 ₽ the discount is 1%
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409. In what mass of water do you need to dissolve 25 g of CuSO4 ∙ 5H2O in order to obtain an 8% (by weight) solution of CuSO4?