js calculate percentage between two numbers

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const x = 30;
const y = 40;

const result = (x / y) * 100;

console.log(result + '%'); // Output: 75% (so x is 75% of y)

// More examples:

console.log((30 / 60) * 100 + '%'); // Output: 50% (30 is 50% of 60)
console.log((10 / 50) * 100 + '%'); // Output: 20% (10 is 20% of 50)

console.log((15 / 10) * 100 + '%'); // Output: 150% (15 is 150% of 10)
console.log((60 / 30) * 100 + '%'); // Output: 200% (60 is 200% of 30)