Chemistry : Percentage Composition of Chemical Compounds

What is the percentage of an element in each chemical compound whose formula is given below? Type only the number as your answer.
Given Atomic Weights:
H = 1 ; C = 12 ; N = 14 ; O = 16 ; Na = 23 ; Mg = 24 ; Al = 27 ; P = 31 ; S = 32 ;
Cl = 35.5 ; K = 39 ; Ca = 40; Cr = 52; Mn = 55 ; Fe = 56 ; Cu = 63.5 ; Zn = 65

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Multiple choice | Fill in the blanks | Match the Columns

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Enter in the box the number corresponding to the right answer
Percentage of Magnesium [Mg] in Magnesium sulfate [MgSO₄]	Hint Hint	1	40

Percentage of Sodium [Na] in Sodium hydroxide [NaOH]	Hint	2	70

Percentage of Iron [Fe] in Ferric oxide [Fe₂O₃]	Hint	3	57.5

Percentage of Sulfur [S] in Sulfur dioxide [SO₂]	Hint	4	20

Percentage of Oxygen [O] in Sodium hydroxide [NaOH]	Hint	5	50

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