Solution of task 5 of Chemistry Book Shimanovich 2003

If the total amount of your purchases from the seller Михаил_Перович more than:
- 18356 ₽ the discount is 15%
- 9178 ₽ the discount is 10%
- 4589 ₽ the discount is 7%
- 1836 ₽ the discount is 5%
- 918 ₽ the discount is 3%
- 459 ₽ the discount is 2%
- 92 ₽ the discount is 1%

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5. The trivalent element oxide contains 31.58% oxygen. Calculate the equivalent, molar and atomic masses of this element.