(Medium) Incremental Delivery

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	// Usage: Copy this code and run in a ES6 capable Browser Console
	function profitFrom({ sell, buy }) {
	const profit = sell - buy;
	return (100 * profit / buy) + '%';
	}
	console.log(`${profitFrom({ buy: 50, sell: 50 }) === '0%' && 'PASSED' \|\| 'FAILED'}: No profit or loss for break even`);
	console.log(`${profitFrom({ buy: 50, sell: 100 }) === '100%' && 'PASSED' \|\| 'FAILED'}: Profit`);
	console.log(`${profitFrom({ buy: 100, sell: 50 }) === '-50%' && 'PASSED' \|\| 'FAILED'}: Loss`);