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 oxide [MgO]	Hint Hint	1	70

Percentage of Sulfur [S] in Sulfur dioxide [SO₂]	Hint	2	60

Percentage of Potassium [K] in Potassium bicarbonate [KHCO₃]	Hint	3	57.5

Percentage of Sodium [Na] in Sodium hydroxide [NaOH]	Hint	4	39

Percentage of Iron [Fe] in Ferric oxide [Fe₂O₃]	Hint	5	50

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