Among the superheroes from Marvel Comics, what is the percentage of those who have the super power of "Super Strength"?
the superheroes from Marvel Comics refers to publisher_name = 'Marvel Comics'; super power of "Super Strength" refers to power_name = 'Super Strength'; Calculation = MULTIPLY(DIVIDE(SUM(power_name = 'Super Strength'), COUNT(id)), 100)
SELECT CAST(COUNT(CASE WHEN T3.power_name = 'Super Strength' THEN T1.id ELSE NULL END) AS REAL) * 100 / COUNT(T1.id) FROM superhero AS T1 INNER JOIN hero_power AS T2 ON T1.id = T2.hero_id INNER JOIN superpower AS T3 ON T2.power_id = T3.id INNER JOIN publisher AS T4 ON T1.publisher_id = T4.id WHERE T4.publisher_name = 'Marvel Comics'