Profit Margin

Create a function that calculates the profit margin given cost_price and sales_price. Return the result as a percentage formatted string, and rounded to one decimal. To calculate profit margin you subtract the cost from the sales price, then divide by sales price.

Examples

profit_margin(50, 50) ➞ "0.0%"

profit_margin(28, 39) ➞ "28.2%"

profit_margin(33, 84) ➞ "60.7%"

Notes

• Remember to return the result as a percentage formatted string.
• Only one decimal should be included.