Refactor calculateBMI function to use toFixed for consistent decimal formatting

Author: TTiamiyu

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -15,8 +15,10 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-    const bmi = weight / (height * height);
-    return Math.round(bmi * 10) / 10;
+  const bmi = weight / (height * height);
+  return Number(bmi.toFixed(1));
+}
+
 }
 
 console.log(calculateBMI(90, 1.85)); // should return 26.3